the B20Z is a JDM only engine. It comes from the Honda S-MX, so I don't know what that means for wiring and whatnot. It probably makes it a little more likely to have had a manual transmission, though.
Like I said earlier, the gs-r intake manifold wont work. I'm pretty sure the B16 one wont either. The head on the B20 is identical to the B18B head, bolt wise. I figured the B16a and B18b intake manifolds weren't interchangeable... correct me if I'm wrong.
Good point on the flywheel, though. I should try and get a decent aftermarket one. As for a clutch, I'll see. I wont be doing many hard launches (only 3 or 4 medium launces per weekend durring the summer

) So a stock b-series clutch would probably do the trick-- aftermarket clutches are freakin expensive.
The LSD will probably have to wait, unless I can find a ITR tranny for cheap... not likely.