Why not take the time to contact carb building specialist. I as well as a number of other LSR racers have had great success using Quickfuel Technology for the proper size carb. Their tech guy not only sized the proper carb he also included the jet size based on location be it on the runways or on the Salt. Thier custom built carb is actually less money than an off the shelf carb from any mail order speed parts merchant.
Save your self time and money why waste a good poly with the wrong carbie size when the experts in the filed can size what works.
Why? Because I've never heard of 'em. Having someone else do it for me seems like taking the easy way out.
I dunno. I'm pretty set on starting off with anything made by carter that I can score cheap, but preferably a Thermoquad, just because everyone will HATE that choice. Besides Moroso make a pretty great 2" tall square bore to spread bore adapter. It's one of those situations I think on a small engine, I can have my cake and eat it too. I'll have plenty of throttle authority so that getting the car rolling on the little 1" primaries won't be a hassle, and those big 2 1/4" secondaries will take over and flow plenty of fuel to get the engine to peak power. They are complicated to tune, they are difficult to get tuning parts for, but jets... that's what drills and silver solder are for! I've got every number drill you can get, every letter drill you can get, and every fractional drill you can get up to 1". The advantages of being a job shop machinist for 15 years!
Failing finding a thermoquad at the april swap meet, I'll order up a remanufactured Edelbrock Thunder AVS from summit racing. I'm leaning towards 650CFM, but there is an 800CFM model. However at that point the primary side starts to become quite large for this little engine, and the velocities will start to be rather low. Since the AVS series carbs don't have annular discharge tubes in the secondaries It's something I have to keep in mind. Oddly the theromquad DOES have annular discharge tubes in the secondaries! I get a straight leg in the primary, and annular in the secondary, which is ideal for my application.