'Pop's Engine' another 440 on the dyno.

IQ52 said
These were ported Indy EZ heads.

Who is preparing the RPM heads? Ask them.

I really don't like to guess and so try to only report on what I have actually done. As I have not tested any RPM heads under similar circumstances, I do not know their capability here. Now having been there.....I do know that super prepped RPM heads will make 787 HP on a normally aspirated, single 4-bbl 451 with 91 octane pump gas.
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Right now, I’m looking at having Indy Cylinder Heads do a full port and polish on them. Just curious if the pick up is going to be worth the cost. My bottom end is a clone/copy of your “pop’s” 440. I actually used that build as the foundation for mine.