I suspect your idle mixtures are set too rich, your carb has 4 screws for that if I am not mistaken, one for each barrel. All I would do is turn the screws in until the engine stumbles, then back it out a quarter turn max.
Of course I will have to "Test Drive" the car, didn't I hear you say it dyno'd at 496 HP ?
__________________
Ray White, Toronto ON
Formerly - The one and only 1973 LeMans 454 "Astro-Jet"
Theres lots of good stuff on Barry Grants site on tuning holleys.also car craft http://www.carcraft.com/techarticles/ccrp_0807_holley_carburetors_basics_guide/index.html
-- Edited by beaumontwagon on Thursday 20th of May 2010 04:16:34 PM
