I am betting the early 5.0 and 5.7 Vortecs used a different chip in the ecm. I believe that a lot of the vehicles of that era used the same ecm, but a different chip. Could you swap a 5.7 in place of a 5.0 of similar vintage? Probably could get by.......would it run right?....probably not really, but you are correct that sensors and ecm would compensate to some extent. Hopefully someone more knowledgeable will weigh in. I know I had a 92 with a 5.7 with a 5 speed (don't hold the buying a 5 speed against me, as that is my last), and the chip for a 5 speed, and automatic was different, and I am betting not even close to being compatible, such as swapping an auto for a 5 speed.
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