hey mate
yeh i've done the rb30
its all pretty straight forward.
rb30e bottom end
c33 rb25de half cut. because there cheap and non vvt
you can run a standard head gasket (rb30 or rb25)
8.2-1 compression
you need to lower your engine,eith with rx7 engine mounts or cut and shut your current ones(the cross member not the mount.
you need a little re wiring nothing major (not sure on costs sorry also done myself)
cost under a grand as i done all the work myself
still n/a at the moment beatins SS commo's and my mates r34 rb25det NEO(stock)
highly recommended.i'm still totaly stock and very happy with my performance.