Ok found out tonight that the motor has a rebuilt bottom end, bored 30 over with i think stock crank and rods, just bigger pistons...the heads apparently have had a valve job, i dont know exactly what...and i already knew about the combo thing working best but without dropping a ton of money on heads what kind of cam springs lifters pushrods rockers intake and carb should i use to get hopefully a little over 400 at the flywheel? Thanks for all the future help