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you'll need a complete engine intake to oilpan and the exhaust manifolds (5.7) wont fit on a 6.1 .I 'd go with an aftermarket header like JBA, also the computer will need to be changed. Fuel system ? Not sure , but would assume it's different....Injectors and pump? And.......
Great now can anyone tell me a good place to get aftermarket 6.1heads summit has edelbrock but I have heard the not really all that great and there also 1800 per side so if I got to pay that much I wand quality