Head cc 62 domes +10cc bore 4.04" deck clearance 0 stroke 2.96" Piston Compression Height: 1.987
That'll get you 11.22:1 cr. So find a piston that's close or a custom set.
I did not see the data for the rod length included in the above, 305 rods were 6.25 and stock rods are 6.123. Which rods were used in the above calculations? Thank you.