Disc Brake Hold Off & Prop Valves

A 750 is absosoeffinglutely not too big, for that combo. lol.

You still haven't said when and where under what circumstances it is rich, and how you know this.
What gears and stall are you running?
Good Morning,
This is a recent build and I have not even put the car on the road yet. I'm about to trailer it to Stark fla. just to the front end lined-up, its hard to find an old school gear head that knows anything about these Mopars. It has 4.11 gears , 29/18.50-15 and 3500 stall
it runs rich at idel. I'm going to bring it up to temp this week end and try to adjust the timing better and work on the carb, I recall the 4 corner screws are about 2 complete turns out. I may need to remove it from the intake and check the, I believe you said transfer slot on the primary side.