is this going to be a street car a strip car track?
when building an engine or doing a swap you have to plan EVERY expense b4 hand, and think of what you want it to do.
this will anwser alot of questions.
an all motor car running more than 250 hp would be runnig some nice compression therfore sleeving an ls would be a very good idea.but bolting on some parts and enjoying the ride is a good safe call.

when i built my car i wanted a little bit of every thing looks performance interior mods stereo, well after spending over 30k in a summer my car is slow ,it comes last in car shows and my stereo was taxed but i love my car
and be prepared to shell out lots $$$$$$$$$$$$ if you want your car to be "fast and __________" because it sounds like you might be thinkin in a whole diffrent world.