Are those two 1Vs? Very sweet setup. Full disclosure: I have a SuperPro car (my avatar car) that runs 9.00s @ 147 mph. It has a cylinder head that flows about one hundred cfm more than a stock head, along with 13.4:1 compression and a big roller cam. A few years ago I decided to try downsizing the three 500 cfm 2Vs that I had been running thinking it couldn't possibly need all that carb. So I meticulously machined up three 350 cfm Holley 2Vs, adding 500 base plates, taper boring the venturiis to mate up the 500 throttle plates to the 350 venturiis. It ran slower than the 500s everywhere - 60 ft times, split times, trap speed yadda, yadda. Hmmmm? So I then reasoned, "if smaller went slower, try bigger." So I made a piloted reamer to open up the venturiis on the three 500s to around 540 cfm each. That is when the car ran its fastest, quickest times. It all boils down to what the engine demands. I've seen all-out racing 300 ci V8s use a Dominator. And those three 540s flow about the same as a Dominator so that seems to fit.