The trucks with the squared-off front fenders (late 70's through mid-80's, IIRC) all have bolt-in front crossmembers that not only have the complete front suspension, but also the front motor mounts. With just a little creative bracket fabrication, they can be adapted to the straight axle frame in a pretty flexible fore-aft position to center the wheels in the fender openings. It will be necessary to do a little fabrication to mount the steering gear and idler arm on opposite sides of the frame to keep the steering geometry correct, or it might be possible to go with a power rack & pinion setup from a full grown truck like a RAM 2500 or something similar.
In the rear, look into installing a Dana Type 70 from a dual wheel 1 ton chassis of several different makes- - - -Chevy, GMC, Ford, MOPAR and International all used various models of the Dana 70, and there are a bunch of ring and pinion ratios available. That gear set and its little brother, the type 60 is heavy enough to live happily in a lot of drag race vehicles. I ran a Type 70 under a pull truck with a 700+ HP MOPAR 440.
Jerry
