340 Piston Selection

I would, in your case, buy a custom piston, with the metric ring pack, and chevy pin size, and run a 6.125 or 6.250 chevy rod. MUCH lighter than any shelf 340 piston, with superior rings. Jmho
Thanks I just had CNC motorsports email me and SRP has some for my bore and they weigh in @ 541 grams but with 65 cc chambers it still only yields 10.0 compression !!!
My block has to be decked and if I ran a 0.27 MLS head gasket maybe that would jack compression up slightly?