Maybe if its installed already. 8 grand isnt much for a swap considering this guy wants an S15.
S15 engine really doesnt have much advantages over the S14 which is considerably cheaper. Sure you get a little more hp but the cost of driveshaft and/or rear diff to make the 6spd work negates the gain since you could put the extra cash into an S14 and it will be just as quick.
Do a search there is plenty discussed on this topic.