That's a good suggestion. For now, I will use the SM420 that came with the truck, and has its own inclosed driveshaft. I do have an SM465 that I will need a new driveshaft for, so I will consider a salvage yard driveshaft once I get the measurements I need. I might just leave the SM420 in place until I convert the truck to 4WD, because then I can get dedicated transfer cases that mate to the back of the SM465.

Looks like exhaust solutions are going to be a challenge. Even with the steering box moved, I have some serious doubts that any headers will clear the frame rails. It's just too tight, and most headers require a good 4 inches on each side to make the bends. Iron manifolds will be tight too, but would fit barely. The tightest thing I've ever seen has to be the Sanderson iron header/manifolds. Someone had a set on their AD truck with V8 conversion, and those babies only require about an inch and a half clearance! But they're about $330 bucks a pair too.
Another option are the TruRam header/manifolds made by Speedway Motors. The iron version is $300 bucks, stainless steel is $350 bucks, and gorgeous polished stainless is $400.
Tough decision.

I do have two header sets I can use. One is a set of shorties from the IROC, but to allow for the AIR tubes makes them require at least 4" if not more, for the turns. They're probably not tight enough. I also have a full length set I could try.

What did you guys do?


52 GMC 3/4 ton pickup
68 Big Block Vette
68 455 Firebird