It's a sickness....

I could see the S 10 chassis with a 3.8L V-6 ,200R4 trans with a/c p/s p/b under that body .
OR to keep it in the "What the heck is that ? " department a \6 904 or 998 or A500 and all the rest .

But to keep it simple just run the stock S-10 4 or 2.8L V6 with stock auto trans . If you start with a good used S-10 you could recoup some of the cost by selling all the body parts .