I have a rebuilt 390FE 30 over so about(397) Perfomer RPM intake compcams XE247. What should the intial timing be? w/out the vacume advance be. Is it possible that my carb could be too small and lean it out untill it dies? It is the stock ford carb from 1964. what would be the lowest it would idle? 1000? 1200? 900? this is my first experience building a non stock engine so any tips would be excellent!!