I found a complete Vortec engine I think I can buy cheap. I have been told that these heads will produce 450+ hp without any modifications. I plan to change pistons, cam, headers, etc. I was wondering about the induction system though. Whether or not it would support that kind of hp or not. Would I need to change Throttle body and injectors or will this plan just not work at all. Does anyone know of any website/sources that can give me ideas as to mods for this engine. Thanks for your help.