360 Carb input

The car has a 3.23 open 489 case. It also has a standard transmission 4 speed. The previous owner told me the carb was 780 Eddie (i see now it should be 750) it has dual fuel inlets to the carb like a DP Holley.
My plans are to put a 3.90 rear axle ratio in there with a sure grip but right now I want to concentrate on the engine. Yes I go to the drag strip every once in awhile but the street will be the place this car is driven most of the time.
The car is actually fairly fuel efficient on the highway at 15.38 miles per gallon on a weekend trip. Average 3000 rpm at 70 miles per hour.
I am all for keeping the current carburetor but I must eliminate this bogging issue.
Yes I did look through several years of previous posting before asking for some more direct help with my post.