I would shot for the higher end of your range for the compression ratio with a 272 cams. The stock big port rods are the lightest in the 4AGE family. You should consider after market rods, or at a min, polished and shoot peen rods. The intake ports would only need a light clean up and bowl plus seat work. The exhaust side would need the same plus opening the port another 3mm. The only save way to check valve to piston clearance is a pre-assembly using clay. Assuming the crank clearances and new bearings are good, plus you verify the oil pump clearance and oil port alignments, the stock crank should live with upper 8000 range RPM. You did not mention if using a header, but you should look at a min 2" Dia. and 2 1/4" exhaust system would be much better with your set-up. Davew7
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