Double pumper with automatic

The fact that a carb is a double pumper is really never the problem...it is the SIZE of it that does. If the carb is too big for a combination, the performance of the car will not be optimal. I've seen a lot of times where you spend more time farting with the spring in the vacuum diaphram to get it to come in where you want it than you ever would with the double pumper. Gas mileage is not a concern because the second pump isn't involved until you get over 30-degrees of throttle opening. Heavier automatic cars tend to like the DP because the extra pump shot helps the moving. I run a fully modified 750 DP on my 340 Demon with a big solid lifter cam, ported X heads, etc. and it just loves it. It has a 727 full manual reverse pattern valve body, 4,000 stall converter and a fabricated 8-3/4 rear with 3.91 Power Lok. Lower gears really help bigger carbs get up into the power band. Like the man said: "If it ain't broke, don't fix it!".