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I have a 72' cutlass Supreme with the same heads and i did just about the same thing with the Speedpro Pistons. I went .30 over on mine. I'm not sure if you're going to find Olds flat tops in a bore smaller than that. My machinist tried to keep the bore down to .20 over, but had to go up from there because we just couldn't find smaller F/T pistons. No big deal though. If they machine the head down a little you'll get close to your 64cc, you might also try to shoot for a thinner head gasket. The Speed Pros advertise 10.5:1 but expect around 10:1CR.
Sounds like a good build, are you upping the cam too? If you're putting those spendy pistons in you may as well throw a few more bucks at it and do the cam too. I did a Crane Powermax cam with .496int/.512exh and hydraulic lifters. That should match pretty well with your pistons. That cam isn't too aggressive and might help your engine breath a little better with those little exhaust valves in that #7 head.
It's a pretty mild cam and it's so radical that you'll have to nurse the pedal it to keep the car idling, but it will give it a little more poop than stock. I wanted to keep mine close the the Olds W31 specs for the 350 and that cam is pretty darn close. (W31 was .490/.490.). The W31 was a pretty potent Olds 350.
Anyway, good luck and keep us posted on what you decide to do.
-Roman
Quick FYI Sumit has the flat tops listed on their website, but when I bought mine they informed me that the site was incorrect and that they were out of stock. You may want to try Jegs if they are out.
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