Engine Swapping

Hey guys I've got my 86 300zx Turbo with 275+ Thousand Kilometers on it and I was thinking about getting a different engine. Would I be able to get another 300zx engine even if it wasnt the right year (but within reason), and install that? What would be the best scenario here? I dont have allot of cash to burn either so keep that in mind.

Its either:

- get a new engine and install it
- sell my car and have nothing or have to wait a year or so to get a better one, or get a pos tempo or something.
- keep the car till the engine goes

Please help me out guys!

RB20DET...200HP...making your car the 200ZR...it's a real car in Japan...a Z31 body w/a Skyline motor. Badass!!!

http://www.fsinet.or.jp/~ranfa/GALLERY/200ZRphoto.htm

That is very cool. How much would an engine like that cost?! I'm on a tight budget so I dont know. And the labor to get it installed, and where I can get an engine like that. Im in Saskatchewan, Canada just to clarify that. Got any price listings for me??!