I have a 1991 Crew Cab(square body) with throttle body injection(stock), I may be able to do a trade for a 1991 454 throttle body injection out of a 1 ton round body truck, will the ECM be the same or would they need to be swapped also? I know I would need a bigger radiator/exhaust fix, but what else would be needed? I was going to build a new carburated big block, but this just came up as a swap.