Your best bet is rebuild it, otherwise it will be doggy trust me, I'd get the TRW forged 2355 sixpack pistons, with a thin head gasket & those 91cc heads, you'll be closer to 10.1, more or less around 9.7.1, it'll run very good with a nice cam & bolt-ons.

75 Duster, 451 10.87 @ 123.58 NA 97 Z28 6sp., 12.01 @ 115 on a 100 shot 71 Swinger. 360 magnum. 12.58 @ 105 78 cutlass, 469 BBC. 12.70 @ 108 on street tires. http://www.youtube.com/watch?v=Z2kqNmMfheU