Does anyone have a compression calculator that can tell me what compression I'll get on this?

Flat top pistons
383 ci
67cc heads

I just found some World S/R Torquer heads a little cheaper than the Dart. (67cc / 170cc runner / 2.02/1.6 valves / .550 springs / straight plugs / 3/8 studs).
$599 plus $70 shipping for the World heads
$639 plus $70 shipping for the Dart

Any thoughts on which is better or does it matter?