I have a 1985 c-10 2wd with a 4.3l v6 4bbl and a th400 long bed. I want to put a purchased 1989 5.7l TBI engine from a 1 ton truck into my C-10. My intention is to convert the TBI to 4bbl and put an HEI distributor in it. Does anyone here have any recommendations as to what manifold/carb combo will work? Do I have to change the distributor drive gear for a softer one since the TBI motor is a roller motor? Am I missing any potential issues with this swap? Thanks for any help you can offer.