528 Hemi help

I am making a callout to all you folk that know the gen II hemi and the aftermarket 528 Hemi. I have a 528 Hemi based off of a Ray Barton 750hp crate motor. I purchased all the parts and built it myself to save some $$ and I like to build everything myself. I have checked all the common stuff and ...well Im lost. I have a Pro systems Holley 850 and if I get the engine to idle its way to fat(rich). If I go to a larger air bleed to lean it out then the engine dies when I pull it in gear. I have a MSD6AL with RN9YC plugs gap at .045. Base timing is 20 and full is 33. Fuel pressure is at 7psi. Floats are set a little low. Its really hard to get to stay running when I first start it but after a few minutes it will run ok. The throttle blades are almost out of the idle circuit. Im not sure what else to do. Any help or new ideas out there?