Hello fellow enthusiast and for info; I have a numbers matching 1972 350 w/TH350 GS with a/c, speed reminder and idiot lights. I am upgrading to a 1975 455 Block with 1972 Stage 1 heads and 1972 Stage 1 carb and a GS TH400 tranny. I wonder do I have to change the engine wiring harness or can i use the 350 one? Thanks everyone.
