Jonathon,
I think you are taking the path seldom taken because the ease of modifying the 60's 1/2 tons without swapping frames. Your 3/4 ton has sloppy manual steering, expensive to repair drum brakes w/single master, and probably 4.10 rear gears, & likely worn out rear suspension. These reasons are why I'm thinking about swapping my 66 C20 cab onto my 93 K20 chassis keeping the injected 350 & 5spd. My 93 is 4x4 ext.cab longbed so I can't use my 8' bed. I would go flatbed. The biggest obstacles are cab mounts (probably easier than AD to S-10 swaps),brake master mounting, & gauges. I might have to use the 93 steering column. This might be feasible because I already have the two trucks.
Still, if you want a performance truck, it would be a good idea to follow everyone else. Start with a 1/2 ton & modify. 60's Chevys are cheap. Otherwise set aside a lot of time to plan & work. If you still want to swap, I would suggest 1988-1995 or so if you want fuel injection. I know the rear of the frame is wider. The 1973-1987 might be the closest in frame compatibility. 1986-87 have TBI with the older frame. Anything with the 6.0(the new series of engines) is gonna have too many obstacles.
Good luck.
Scott
Last edited by Neo '50 3100; 04/18/2009 6:55 AM.