Wow, that sounds like a very easy swap. You'll need the V8 motor mount for the frame and the mount mount receiver cups that mount to the V8 engine. Other than that it's going to be a simple swap. One issue you will have is fuel pressure, too much of it. Get a regulator and set it for 4 lbs of fuel delivery for the carb. You can raise the pressue later if it ever starves for fuel. Be sure it's a return style regulator so you don't overheat the fuel pump. I've read that the V8 and V6 both used the same wiring harness. If you got a 1992 V8 to swap into it you may be able to simplify things even more. Considering the fact that you're really not gaining any HP by switching to the older V8, I personally wouldn't waste my time swapping in a stock V8 from that generation truck. Hopefully you're considering some sort of crate engine with at least 250 HP. My 93 V8 engine was 100% dog!