Best Bang for the Buck Head???

RPM gap with the 750 dp. I brought a 625 carter and a 750 dp to the strip and swapped them to see if the 625 would run the same E.T. I did this on a very mild 360 with 3000 stall and 3.91 gears. The 750 ran about 2 tenths faster and about 1 1/2 mile per hour faster. The 625 did run about the same in the 330 ft.