Stop in for a cup of coffee

Mopar Tim said

just me, but why not
By the time you get a 906 or a 452 set of iron heads ready to make 500 horsepower, with a mild cam (or a radical cam for that matter), you could have bought set of better aluminum heads. Well, unless you own a head porting shop.

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Exactly, A friend bought a nicely ported pair of 906's from a guy that wanted more. They were all set up and ready to roll. He had them checked and bolted them to his fairly mild 440 and made 490+ horse and 500 ft/lb. (with a CH4B Edelbrock dual plane)