Well it depends what the end use is??? And what vehicle it's going in?? And the "B" word "budget"?? Are you doing a stock rebuild, street/strip, race only etc... If your going for max performance you'd want new heads. By the time you put bigger valves, port and polish, hardened seats, spring kit, guides etc...you'll be very close to a new set of Edelbrock aluminums. If these were say a set of rare heads or needed in a numbers matching situation then it'll be worth the while. It all boils down to what yer buildin!!

G.