Without "help" from a machine shop? So you have valve grinding equipment? Cam bearing tool? Hot tank? Crank polisher? One cannot do a "rebuild" without these operations being performed. Simply installing new parts without proper preparation is a recipe for disaster.
Even IF the bores are within "spec" (<.005" taper), re-ringing is "iffy" at best.
"Dishing" the pistons is the best way to reduce compression, making the small-chamber heads the best choice. We use the Speed Pro L2262F-xxx for this. Reasonably prced and tough stuff. Plenty of "meat" in the head for a dish.
FWIW
Jim
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