Ok for starters the steel shim gasket probably is not going to fit unless after cutting you have the worlds tallest deck height "b" block produced - the min piston to head clearance should be in the 30-35 thou region, the steel shim is .020

Once you have your actual piston to deck height, use an online dynamic compression calculator - the static compression you need will be determined by the cam duration or vice versa - the dynamic ratio should not be more than 8.2ish for premium fuel (subject to debate for ally heads)

fast68's advice is pretty good

There are a few recent threads on squish and quench on here and plenty on the web otherwise, check out dcr vs scr too

An additional issue with stock rockers on any aftermarket head - the stock rockers are closer to 1.4 ratio, not the 1.5 ratio the cam specs are rated at - the ally heads flow much better at higher lift, Ideally some new rockers would help to achieve that lift - check out other Hughes and Howards cams grinds either side of the one mentioned too