Performer RPM Cylinder Heads For S/B Chrysler

Would these cylinder heads work on a 1965 Mopar 273?
Aluminum Cylinder Heads - Chrysler - Small-Block - Performer RPM - Edelbrock, LLC.
Is the 63 cc chamber too large, hence, compression ratio would be too low? Could I "shave the head" to raise the compression, or, would it be better to swap the pistons?