Hey everyone im new here. I was wondering how ths comb for my 86 would work out.GT-40X heads new from jegs E-303 cam with new liftersand FMS 1.7 roller rocker arms Eldelbrock RPM intakeHolley 600 CFM carball of this will be going into a '90 block and the transmission is a C4and do you think this combo would put me over 300 RWHP? If not how much could I get out of this?

Tuned correctly it should give you just over 300rwhp

get the heads ported and then 300 wheel will be right there. but i would suggest a slightly better cam, the trick flow stage 1 or the b cam. but that combo sounds good.

Then if I added long tube headers an O/R h pipe and flowmasters 40 series mufflers with 2 1/4 pipe what should I be at?

Should I have to worry about and clearence issues with a bigger cam? how would the F cam be?