Looking for 273 piston and ring options

ok, 235/273 piston, has c.d of 1.770 + dome hgt of .150 dome has to be +.129 out of block
with 57.3 cc head, comes to 10.54 cr. the 180/273 piston sits -.011 down, with 57.3 cc head, has 9.1 cr.