The part number on the Speedmaster box is pce218-1731, which is the CNC ported 325cc head.
Curiosity got to me, so I checked it...... 301cc(I actually thought it was going to be just under 300). I don't know where the "325" comes from........why not just call it a "300"? Maybe they figure the bigger number would sell better.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads