If there stock Holley original three circuit carbs. they will run really rich at part throttle Really rich like 11.0 to 11.5 AFR or worst You might want to send them to a good custom carb. shop and have them set up for your car for street use I have dyno tested and then raced and modified several Holley three circuit HP 1050 Dominator,9375-2 List #. I had to reduce the intermediate fuel feed and the idle fuel feed to clean them up, I also had to greatly enlarge the intermediate air bleeds to get a bog out of them when foot brake drag racing them before changing the fuel feed circuits Everything mechanical is fixable BTW, what are the list # on both of your carbs? Or are they custom built carbs. built by a carb. shop by someone other than Holley? It can and does makes a difference