Thanks for the info, I was going to use the N42 intake manifold (pre egr) and find a 60mm throttle body to put on it, if I go with the P79 head I'll use my 6-1 or 6-2-1 headers (they're both round). As for the actual induction I was thinking running the stock airbox without the top half (the flat flute) with the filter held in place by a custom mounting bracket. I'd think the larger rectangular body into the hole design would put more pressure into the intake than a "ram air/cold air" tube would when moving, but I'm going to play with that I guess.
We've taken L28s apart before, for valve and cylinder wall repairs; I'm not to worried about parts getting miss matched. Also I have so many gasket kits... really want to use them... lol
I'm wanting to put a Megasquirt 2 in the NA at some point, have a wide band O2 sensor and some other misc parts sitting around that could be put to good use.
Mainly I just wanted to get as much out of an NA engine as I could and since I had all these misc parts I know people have done some crazy combos and gotten interesting results. Needed to know if it was worth doing a high CR on an L28 (read a few forum posts on it, and agree retarding the timing to get high cr engines to not knock kinda defeats the overall goal.)