it fits well. the engine bays of the zx and earlier z's are practically the same. check out hybridz.org and zcar.com for more ideas and pics of some z's with rb's stuffed into them. z31 300zx also like to be powered by rb's azzcar.com has some pics I believe. if you google rb powered z You'll find tons of info. Youtube also has a couple videos of rb powered z's. good luck man
-mike
-mike