I have a 1986 ford f150 with a 302 5.o EFI and auto transmission that i just rebuilt, I went .20 over on the pistons .18 over on the valves installed a b303 com with GT40P heads, mid length headers a flowmaster 40 muffler it runs really good over 1000 RPMS lower than this it wants to stall out my timing is set at a base of 23 and total timing at 40 any suggestions ?