Looking for a carb recommendation

Have a Holley 950HP on a setup similar to yours and the car is mostly street driven. With the old camshaft and ignition, the carb was great. With the bigger roller cam and new ignition system, I can't get it to idle worth a crap when in gear. My engine guy couldn't get it to idle well either. He thinks it's something to do with the distributor and the timing going out of whack due to the lope, but who knows. I know that it was really nice with the old setup but it's struggling with this setup to idle. Other than that, it's been a good carb.