My car has everything hooked up for ac, need a new compressor though it went out on my right before this last winter.
I didn't really notice any fumes when we rode around in it, but then again that was only for ~15 minutes, windows down.
as far as body work and the engine swap, he did it all himself. Someone that he knows, could be his father, I'm not too sure exactly, has some sort of shop they did this all in. It really was a very clean car. He did also mention it had a lifter tick, as we know it's usually on start up, and when it gets to operating temperatures it slowly fades away, but we both drove around-about an hour to meet up, so I wasn't able to hear anything.
Also, you're very right about the whole rb shenanigans. If anything goes wrong with my Ls, well hell, I'll just make a quick trip to the parts store. Rb land... Well, guess we'll have to get overnight parts from Japan!!
Thanks for the serious input, will be looking into it in more depth.