Race Carb: Double Pumper or Vacuum Secondary

[Reaper_4x4]

So I am trying to match up my in-progress stroker motor build with the right carburetor. Its a '93 4.0 block bored way over and making somewhere around 4.7 - 4.9 displacement with the 258 crank and long piston rods (motor is being rebuilt and I am the 3rd owner of the motor so I only know a minimal amount about the make up of the motor). My engine builder suggests a Holley 780 cfm with Vacuum secondary while the previous owner of the motor suggests a double pumper since it will literally only be used as a muddrag car and will never see pavement. The specs of the motor, to the best of my knowledge, are: very high compression approx. 12-13:1 (just milled the head again so havent calculated compression ratio yet), motor will be running at max RPM of 6000 (electronic rev limiter), motor is supposed to be making around 400hp, and again it will only be used in mud drags, not at all intended for trails or rocks and it will have a stall converter set at 2,500RPM approximately.

Does anyone have a similar set up as this where they're making high RPM hp and race with their stroker and are using a carburetor? Just curious to see what other people are using so I can get an idea of what works best for my application so when it comes time to put the whole thing together I can have the right carb ready to go. Any suggestions would be appreciated.

[Newcomerracing]

Most definitely a double pumper and believe it or not bigger is better in this case. I have done a lot of dyno testing to back up this claim, We have ran anything from a 390(Nascar Dp 800cfm) to a 830(Nascar Dp 1,200cfm) carb on these motors in displacement ranges from 4.5 thru 4.9 liters. I've started the dyno pulls as low as 2,000rpm's normally 2,500-3,000rpm's, every time we go bigger it helps all the way through the powerband. With out a doubt this will not work well from idle on the street in a heavy 4x4 but in a race application or a big stall converter this is the ticket. We have a customer that has a 4.9L drag rail jeep thats making around 450 range with a 750 holley that turns 8,500 rpm's. Check out this youtube video, the rail jeep is in the right lane. http://www.youtube.com/watch?v=K7FwPlNKOqY