I'm with Loren, a built, swapped, or mini-me engine will put you into the Street Modified class, where you will be constantly beaten by people with much faster cars who have much more experience. Its very frustrating. The best thing to do is to swap in another stock motor or fix your current one, and run in the stock classes till you get a feel for things. When you feel like your car is slowing you down (which won't be for a long time) then you should start doing performance mods.