Max horsepower with EQ heads?

So what would the choke rpm be on a standardport big block 906 iron head be? Heads were ported, gasket matched to a regular port size intake. The motor is/ was 535 cubic inch.
Take a look at this...not a full on "kill" build, but a good effort build....How to Make 600 HP with Cast-Iron Heads on a Mopar 340 Stroker