88mm bore would be 2.1, 87 is like 2.045 or close to that.
passing the 200whp mark is pretty common with basic parts even on a stock compression VE, It has a lot to do with the tune. A basic ve tune wont cut it. My buddies full bolt on VE, Ported n1 intake and throttle body, pullies, ssac header w/ badly dented secondaries (Id say dented in about 1/2" or more, calum realtime, n1 cams on stock springs and retainers, JWT 8lb flywheel, stock port head not even port matched, SSAC not port matched as well. Started out at 168whp when we went in with just a basic Calum VE n1 tune, after I was finished with it I was at 191 then later put the cams back to 0,0 and eclipsed 200whp and moved the powerband up. Cams were at +5,-5 the first time around.
I could definitely see 220whp with a good 4-1 header, some port match work on the intake and header, and especially with some 12.5:1 pistons in there. I wouldnt see why 215-220 wouldnt be easily attainable.