Al, Darryl recently moved into a new shop and I do not have that number yet. All I have is his cell phone and I'm not sure if he would want me to post it. I will be speaking to him on Monday and will ask him what number to give out.
Mark in regards to IRS or straight axle, it's really a matter of budget and personal choice or desire. An IRS will almost always ride better and if it is a good design and setup correctly, will usually outhandle a straight axle. I say usually, because sometimes the performace margins between the two are so small and a particular course or driving style can slant the favor towards one or the other. So in my humble opinion the questions below are the decision points that may help you decide.
IRS:
1. Do you want to spend the extra money ($3-5k more)?
2. Are going to build the car more for ride/handling than straight ahead racing?
3. Do you want a bigger WOW factor for your car and suspension?
4. Are you willing to put in the extra effort to make an IRS work in a car that never had one?
Solid axle:
1. Are you building the car on a budget?
2. Are you willing to give up a little handling/ride quality for better straight line acceleration?
3. Are you looking to keep the car as low-maintenance as possible?
All that being said, knowing what a hassle it was for me, and not knowing you, I'd recommend a solid 9 inch with coilovers and a multi-link setup. You'll save thousands and will probably never realize the difference. The best/coolest unit on the market is from Total Control Products by Alston Chassis works and is the design that Unique motors uses in their Eleanor replicas. And if you ask them, they'll tell you their unit is superior to an IRS. Air Ride suspension has also come out with a bolt-in setup for early Mustangs, but does not seem to be as trick as TCP and uses air shocks (which is a whole different discussion).
If you have the money, skill and patience then an IRS is trick and has the ultimate WOW factor, but there are only two somewhat "bolt in" choices. One is the CTM style that I used (link is in my previous post) and the other is by DVS restorations (
http://www.dvsrestorations.com/) which uses a late model Mustang IRS. In my humble opinion, I'm not sure I would use either one. The CTM unit is under-engineered and the DVS is ugly and heavy. I have gone a little over the top on the next build of my car by doing a complete frame and custom suspension, but this was the only way I could get the performance, look, and peace-of-mind that I wanted.
I hope this helped, feel free to ask anymore questions.
Thanks, Mike
Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
Short clips: Goodguys Pleasanton autocross and pit videos
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