Carb Help Please

I have been trying to get my 74 dart to run right with this new engine. I recently installed a 360 magnum that I have carbureted. Engine has a 750 willys (Holley Double pumper) and a dual plane intake. I have the timing at around 14 before top dead center. I tuned the carb and set the timing with a vacuum gauge. I adjusted them so I had the most vacuum. I did timing so I advanced it to highest vacuum first then retarded it and inch and a half. I checked it with a timing light but since factory timing cover only goes to 10 it is hard to tell. I can see the line a little above 10 degrees before top dead center, looked around 14 degrees. I timed it at idle warm and then after I had it adjusted I started tuning the carb. It has the holley double pumper built by willys with no choke horn. I screwed idle screws all the way in and then backed them out to 2 and a half turns. I kept tuning and tuning but the highest vacuum was with the car richened up quite a bit to around 4 1/2 turns out each. If I put it in gear it sounds almost cammed where you can hear it hitting on the cylinders. I have tried retiming it multiple times and it always does this. The more I work at it the better it runs but will bog with quick acceleration. I currently have the exhaust coming from manifolds and dumping at my feet. I am trying to get it tuned in decent enough to drive it to get the exhaust done but I can't get it to quit sputtering. If I accelerate slowly it will run with very little sputter. If rev it in gear it will squeal tires. If I accelerate quickly it will cut out and sputter. If I stomp it to the floor like the dirty ***** it is acting like it screams....I am at a loss. Carb was rebuilt but power valves weren't, ANY help is appreciated.