I'm not sure exactly which body you have, but I'll mention this anyway. If you use a 2WD S10 donor, you might need some outward offset wheels or a rear end from a 4wd/AWD S10, as they are 4 inches wider than the 2WD rear. I used the AWD rear on my 46 panel. The 2WD rear rbbed the inboard side of the tires when using the factory S10 2WD steel rims.

46 Chev One Ton Panel - S10 Frame Project

"What if the Hokey-Pokey is REALLY what it's all about?" - J. Buffet