Mine works killer. Homebuilt, 650 DP. No mods to pvcr's or bleeds. I honestly believe in my case and others below 370" or so the 650 is the way to fly. Smaller venturis maybe pull harder out of the boosters? My car is jetted up 3/7 I think, (off the head, but it's been awhile, don't hold me to it, like 75/81)and has AFR's right around 12:1 at 13lbs of boost on pump 92. Made 400 to the tires with a very stock 318 and went 120 in the 1/4 at 3500 race weight.
A guy named Ira on theturboforums went like 5.80's on a 650 carb and a 355 with an ancient TV8101 single turbo.
11.48 @ 120 with a 1.80 60' 318, stock 1.88 heads, stock 904, Pump Gas, 13 lbs of boost.
9.94 @ 134, 318 on pump gas, 14 lbs w/ Eddies, transbrake 727, 3600 lbs, 3.54 gear and 28's.
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