I would go with the stud mounts and say 10:1 or 10.5:1 with nitrous. Depending upon the exact pistons, gaskets, etc. that you end up with you'll most likely be around 10:1 with flat-top pistons and 58 cc heads. 64 cc's would drop to around 9.4:1 or so.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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