Which head is the MP P5153875 in you comments above?
These:
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Without digging through my notes I want to say the Edelbrock version was right around 320...... ootb. (Found my notes 317 ootb, 323 with 3 minute blend)
The MP Edelbrock head with a basic clean up of the entire port ends up in the 350’s. A more serious effort, but still no “tubes” gets you another 20cfm.
One of the 370cfm sets I did went on a 12.5:1 496 and made right around 800hp.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
