390 stroker build

Some basics - If you are running factory heads then you will still want to run a dished piston. That will give you a static compression anywhere from 9-10:1. Factory heads are terrible in terms of tendency to detonate so you want to be very careful about the cam choice. IMO, the 284/484 is a mistake. If you have to stick with the MP line up the 509 is a better choice, although honestly I wouldn't run any of the MP camshafts because there are MUCH better out there. If you go modern design, look for something in the 235° @ .050 to 245° @ .050 and you should be fine. Anything less (smaller) and you may have issues with pinging.