71 Dart / 5.9 Magnum / Procharger

Okay guys, got the procharger all mounted on to the 414 Built for boost. Keep in mind this is the same blow through carb that I was running with the old magnum motor. Haven't made any adjustments or changes to the carb but it has sit for over 6 months so might be gummed up?

Anyway, started the car and everything was fine but it didn't want to idle. Simple turn of the idle screw and adjusted the 4 corner idle screws and got it running good at idle. (14s AFR). Took it for a drive and right when I lightly pressed the throttle it ran like total crap.... looked down and it's PIG RICH... 8.5:1 AFR. Turned around and went back to house.

Haven't had time to mess with it since then. Hope to tonight. Where to start? Take off primary fuel bowl and look for stuck float? But if that's it you wouldn't think it would idle good? Maybe dirty needle and seat? Would this blow through carb have any special needle and seat or just a stock one? Thanks in advance for any help or advice.