i have a 302 shortblock that i am told is from a 91 truck, with a stock truck cam and cast .040 over federal mon-something pistons. I am told it is non high output (whats that mean?)...So give me reasons why this would have suposedly came out of a 92 mustang gt (bought as a 92 mustang 302 motor with 60k original miles, got home and found all this out from someone) thanks for your help in solving my dilema