best carb for 340?

I had a mild 360 (.484 lift, 340 J heads, headers) and 3.91 gears. I took 2 carbs to the drag strip. A 750 dp Holley and a 625 Carter. The 750 ran almost 2 tenths faster and a little over 1 mph. The 625 did cut the same 60 ft time.