That sounds in the ballpark for advance. You may have a fuel delivery issue. Assuming choke is open all the way and you are running with the flame arrestor off. Have you checked for a vacuum leak at the base of the carb. A big leak can throw things off.
CUSTOM WHEEL & TIRE PACKAGES
$125 LED LIGHT PACKAGE - FREE SHIPPING
REBUILDING HOLLEY MARINE CARBURETORS - $249 DELIVERED
REBUILT COMPLETE MARINE HOLLEY 4160 CARBS - $425 DELIVERED
Email - firstname.lastname@example.org