Considering M30 swap

[kronus]

Also I've been using this site for most of my research so far, thanks to that guy for compiling it, wherever he is.

[kronus]

I can get my hands on an M30B35 from an E28 (I think it's a B35, at least), maybe a 5-speed from an early 318i (should be a G265, right?) and the radiator/plumbing from the same 318i, and already have the big-guibo eta driveshaft (because I have a late, 4/87 eta). From various snippets, I have gathered that my Motronic 1.0 manual eta wiring harness will also work.

Aside from motor mount arms, does this sound like everything major I need for an M30-powered e30? I'm not sure what tranny mount I will need to use, but I've heard (from GG) that an e30 M3 mount will work.

Further annoying questions:
How's the fuel economy?
How does an M30 react to cams? Are there any out there? Any other way to easily let out the beast in the M30?
Which ECU should I use?
Is there a convenient car I can swindle headers/exhaust from that will clear the e30 frame?