Here's one issue I had with the engine, the Hooker headers. I had a well fitting set of Hedman mid length headers on the car before but wanted the slight advantage of a basic long tube so I went with the Hooker name. Hooker doesn't have a specific G body part number, but rather the catalog lists this generic part number as one that "will fit" pretty much any GM chassis, including the listied g-body. I should've been skeptical at that, these headers are total crap. The tube alignment at the flange is off, the oval rather than round holes at the flange don't line up with the gasket at all and look like they would be a flow restriction, and worst of all they don't fit a g-body chassis without modification. In hindsight I should've sent them back, but instead I messed with them to make them work. What a pain it turned out to be.
First off I gasket matched them a bit, radiusing the ends as much as I could without taking too much out of the weld.
Then I had to bang on the driver's side lower outer tube to clear the lower control arm. I didn't want to affect flow too much so I only dented it in about 1/4", but it wasn't enough...
I then got up underneath and trimmed the control arm mount several times until the header would finally fit without touching the frame. I had to whack off a pretty good chunk. Remember the braces I made for this area? Yeah there was no way they'd fit with these headers either. I didn't want to remove the bolts to get them out because I was under a time constraint and removing the bolts meant that the control arm, spring, and shock would have to come out and be re-installed, so I simply cut them out. I was pretty disappointed to have to do this.
All in all I was very disappointed with them. I guess you have to buy Super Comps instead of their street header to get any sort of quality and decent fit. Boo on Hooker for being a big enough company to produce a decent product but rather to cut costs puts out garbage. I certainly wouldn't recommend them for anyone with a g-body.