M52 (328) and s52 (m3) motors have an aluminum crankcase, which makes them better for forced induction. However, you can boost stock e30's. An s52 swap and a FI kit in a e30 would fly.
I dont know about shoot the breeze, rocco's really busy these days, but i'm sure he could answer your questions. He owns RMP motors, #'s 905 951 0002
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Hot: 2001 Estoril M Roadster
ZCP 19's michelin supersports, ZHP knob, JL 8W3
Cold: 2002 TiAg M3 6mt deoranged, dechromed, led tails, ZHP knob, UUC SS v3, GROM, OEM 18's w310's,
Fun: 2006 YZF-R6, black, ohlins, pazzo, cat delete, vance hines csone, YEC racing tune