I have a 1989 5.0 EFI that I want to swap over to carb and I have a couple questions will an edelbrock performer intake and carb fit from my 1984 mustang with 302 fit onto my 89 302 EFI out of a mercury grand marque?? and what all do I have to hook up on a HEI conversion distributor?? they say only one wire hook up?? do I need a MSD igntion box or do I just need 12V switched power??