Another carb question

ok guys been having trouble getting my combo to run well. I have 3 different carbs lying around and just can't seem to be the right combo together.

My setup is a stock 1976 RV 360bottom end, Eddie rpm heads, lunati voodoo 226/234 @.050 lift 494/513, rpm air gap intake, stock electronic ignition with a jegs adjustable distributor, 16/17* initial and 34/35* all in around 2500

I have a Holley r47774 650dp mech sec jets 67/73 squirt 28/28 and 6.5pv, this ran ok but was lean, just didn't quite rev quick or pulled very hard compared to 750s

Next is a Holley 3752(can't seem to find out exactly what this carb is) best guess 750dp , jets 68/76 sqrt 28/31 6.5pv, ran the best but is super rich at idle and plugs are black.

Last is a speed demon 750, jets 76/83, Sqrt 31/31, 6.5pv, ran ok but rich, leaned jets up to 72/79 damn thing would barely idle and kept back firing.

Any suggestions would be great! I think my next step is to take the Holley 760 and lean it out by 2 jet sizes.