Unless the Tw heads are professionally ported, they are NOT as good as the AFR heads. The 468 HP 302 was a 12 to one motor, with a solid flat tappet cam ( like 248 at 050 ) RPM performer with a reworked 650 Demon carb. It peaked at 7000 RPM and he could rev it up tp 75-7600 whenever he wanted to.He alway ran on race gas ( 110 octane ) I did another 302 hotty that made 504 or 506 with a roller cam and AFR heads too.

JOE SHERMAN RACING ENGINES