New Edelbrocks are $2,600 delivered to your door. You have 540 cubic inches. To bring your heads up to speed for this size motor will take CNC porting, new guides, bigger intake valves, valve job, freight to and from (UPS is high) & more. (Yes, your bill is liable to be more than $2,600.) If somebody gave you your heads for free it would be a bad deal for you try to make them work for your engine. Buy the Edelbrocks and sell yours for cash. You will be money ahead. Way ahead.