[whitedog76]

I would stay away from a 4.3. The best my S10 Blazer ever did on fuel economy was 18 mpg. Not to mention GM made about a dozen variants of the 4.3. Odd fire, even fire, balance shafts non balance shaft, flat tappet, roller lifter, 2 bbl, 4 bbl, TBI, CPI, SFI, long crankshaft, short crankshaft, etc... If you're doing a swap, you would be better off buying a complete vehicle.