Alright well here are my options...  and you guys are awesome for replying so fast I really appreciate it! 
-I own a 73 240z with a poor body probably beyond repair , but the engine is good (the one i own is in my display picture) 
-I have been looking at some local sources and I have found a man who "claims" his 74 Datsun is a 280z.  So maybe its a 75? 
So what I was thinking of doing was putting my engine into the 280z and calling it a day.  Now what are some things I have to look out for here?  I know that the door mechanics are different and there are different carbs for the engines.  But my main concern is the body type.  I really want a body without the longer back of the 280z.  The one this guy has appears to have a shorter back.  If they are roughly the same I can put two together and come out with something better.  Anyways he is asking a reasonable price for it.  I have yet to go to him and see how bad the rust is.  I can probably get some pictures for you people if you really want.  That way you could all help me out and I would be on my way to becoming a proud datsun owner. 
Thanks for listening! 
Mike