Sorry, didn't mean cubic inches...meant about compression (and not really knowing the proper term), but after looking around, it doesn't affect that either.
I'm a nublet, sry.
You can swap the heads and intake on a N*. BUT, if you swap the heads on the N*, it flips the cams, gears, valves, etc... as well. Performance might be a bit different with the valves flipped. (1.229 intake and 2.90 exhaust iirc) It's not QUITE as easy as just flipping them around. I have a Northstar and I've tried it just messing around b/c I read about the process elsewhere....flipping the heads is alot of extra work.
Not only that, but the exhaust ports end up on top of the engine....talk about heat buildup!
Now, if I could only find a cheap timesert kit, I could get it running.