There's really no reason to swap out the VG30. Many have asked your same question, but regarding a Z32. Go to twinturbo.net and do a "search" for more info. Just do a "search"; don't start a new thread about it or you will get flamed.

An 87 300ZX has plenty of potential and is lighter than their bigger brothers. Engines are pretty much the same, although I believe in 87 they were still inline and not V's.