I won't be able to get a measurement for a couple of days, but I'll post it here probably Sunday afternoon.

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A couple days late, but I measure 2 1/2" from the engine crossmember to bottom of the block where the oil pan mounts to.

That's a disparity of 1-1/8" between where you are at with your set-up and the height at which the new Hooker brackets locate the engine. I would guess the new Hooker headers might have interference with the floor on your car since there is only about 1" of clearance between the header collectors and the floor when used with the Hooker mount kit.

My calculator says 7/8" of difference, but I agree that might be too close.

Yeah, I realized my math error after I sending my reply...reminder to self not to attempt math in my head before having my morning cup of coffee. With the actual difference being 7/8", the fitment of the new Hooker headers on your car will be damn close for sure, but may just be worth borrowing the set from your friend to try in out as it may solve your problem.

Well, after a few weeks of researching, emailing, PM'ing, three different threads on three different sites...I had narrowed it down between the Dynatech's and the Doug's 3337's. I ruled out the Texas Speed because there just wasn't enough info on them, and I wasn't crazy about the design.

The guys from Dynatech were great with trying to help, but it's the same design as the Texas Speed stuff (still wondering if Texas Speed copied them, or if Dynatech is making their headers).

So I ordered a set of the Doug's 3337's (jwcarguy's pics helped push me to the final decision). My only hesitation was that they look identical to the ebay brand headers that I was looking to get rid of. In fact, when I first got them, I thought they were identical, but there are subtle differences in the tube design (i.e. the guys in China didn't do a perfect job on the knockoff). I installed them this weekend. I ended up moving my engine and transmission about 3/4" back towards the firewall and I'm very happy with the clearance.

ebay Header passenger side:
http://i228.photobucket.com/albums/e...psfbc31852.jpg

Doug's 3337 passenger side:
http://i228.photobucket.com/albums/e...pse64ad6b2.jpg

ebay Header driver side:
http://i228.photobucket.com/albums/e...ps51333cc9.jpg

Doug's 3337 driver side:
http://i228.photobucket.com/albums/e...ps58e7083a.jpg

Doug's clearance:
http://i228.photobucket.com/albums/e...psda6a2802.jpg

http://i228.photobucket.com/albums/e...psa452e967.jpg

http://i228.photobucket.com/albums/e...pscd8a0cea.jpg

Doug's driver side ground clearance:
http://i228.photobucket.com/albums/e...psf0b1cb99.jpg

Doug's passenger side ground clearance:
http://i228.photobucket.com/albums/e...psd00310ef.jpg

About 4" of clearance on passenger side, and 4.5" on driver side:
http://i228.photobucket.com/albums/e...ps615dbca3.jpg

that looks pretty good, nice fitment.

What engine mounts again?

LOL, I was just going back through the thread to see if I had posted it here.

I'm using the tall & narrow '69 Z28/350 frame mounts (3945507/8) and the tall & narrow Energy Suspension motor mounts (3.1117G). Along with the Dirty Dingo Sliders, and a BMR adjustable T56 trans crossmember.

Awesome stuff!

Glad you found something that fit so nice for you!

Can you do me a favor and see if you can get an accurate measurement to a fixed point for me?

Maybe from the front left bolt on the steering box to a point on the engine; like a header bolt or something? I'd like to see where my engine is sitting in relation to yours.

Really, this is what all of us need from the manufacturers. Instead of telling us that this will fit with such and such mounts (which isn't always guaranteed) they should have measurements of where the engine should be sitting (for their headers) that we can use to compare. The best measurements would probably be off of the subframe or at least something bolted to it.

I'm still waiting on some parts to be powder coated before I put the subframe I re-manufactured back under my car but after that I should be needing to order headers really quick.

That's great that something came together for you finally 67rally, seems to work real well for you.

obeerwan- that's a good point you made and in the case of an LS swap 1st-gen F-body/3rd-gen Nova like 67rally has the new Hooker engine mounting brackets for that application position the machined front surface of the engine block 1/2" back from the front wall of the primary engine crossmember. That equates to the typical distance between the back of the passenger side cylinder head and the firewall being 1-1/2". Maybe this info will help others starting this swap.