carb suggestions

I currently have a 670 street avenger carb with 72 jets in primary and 78 jets in secondary. Its been getting me down the track @13.3 @103. Would going to a 650 double pump net me more power or a better MPH or would i need to step up to 750.

the car is a 70 dart swinger with 360 magnum, unkown specs on cam but bigger than stock, eddy rpm, 670 streetavenger, TTI thermal headers, A904 with 2200 stall, 8 3/4 with 2:76 gears, but after this weekend switching to 3:55 gears.