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For clarity's sake there is a difference between the tbi and Vortec applications, but it's a simple fix. The Vortec motors have 2 O2 sensors where the tbi motors have only one. I know this is true for the 454's, I'd imagine it's the same for the small blocks. Structurally the headers fit the same on all GMT400's (squarebody headers will NOT fit), you just need to make provisions for the other O2 sensor.
My 91 2WD has the offset motor too.
www.gmt400.com
My 88 C1500 is offset too.
The offset isn't drive dependent.
Well that is interesting, as I thought it was done to give extra clearance for the front diff etc. Considering they have different chassis they had no reason to do it on the 2x4s if that was the case. Now it has piqued my curiosity, I will have to look for an answer.
IDK for sure, I'm thinking it's offset to make room for the steering shaft and gearbox. I'd say torque but, most of those motors hardly made any, LOL
