I am building a 1964 Impala SS Convertible with Correct 425HP 409 Engine (4-Speed). Block is 3844422, Heads are 3852583, intake is 3814881 and carbs are Carter AFB 3361S and 3804S (option is to replace with 3362S). My question is what CAM to use and what parts do I need to purchase for refurbishing the 583 Heads. I wish to ask the experts here and not rely on the Machine Shop suggestions. Thank you