cam question

i have a solid flat that is 258 258 @.050 .615 .615. my engine is a 472 ci. with a429 heads flow unknown victor 950 hp holley 10.3 to 1 comp. 3500 stall 3.89 gear 28" tall mt dr #3870. i've been reading on the the site that a dual patterm cam is a better choice. what kind of hp gain would i see with a dual patterm cam .

Thats a loaded question........ Call Randy or Lem and get a custom cam recomendation...... Gain could be big for the right application.