How are your welding skills? if they aren't good, go w/ a supercharger. As for engine parts, if you ask/tell the seller what the application is going to be they should set you up with the right parts. It all depends on your budget and performance goals. For something that will be 6-8psi you don't need a lot of special parts. If you are going to push 12-14-16 you'll need to ask about special pistons, coatings and so on.