79 360 cam selection

the printed info on 318 heads shows low 60's cc wise, and they actually measure 68cc..
same with x/j etc..all were printed as 65-68cc and they're 72cc measured
'302' heads I just picked up for testing measure 64cc and have the same 124cc intake port as regular '675' heads.
same with slants too, 57cc or so and bigger.