Yeah you are right 4 Jaw the 780 3310-1 is a nice carb. I have two of them. I put one on my Camaro, which is the car that I was thinking of putting the 2 bbl on. The Camaro has a 400 that is 10.5:1 and has stock 1.94 1.50 valves. It has a .480"lift and 230@ .50 duration. The 3310-1 was still a little too big. I put on a carb that worked much better. The Holley 4609. It is a replacement Shelby carb. It is rated at 730 CFMs and is like the 3310 only it has the high signal, bell shaped, truck primary boosters, and has downleg secondaries. It has better metering at cruise, and killer top end. Primary jetting is 66 and secondary is 79. It is like having a squarebore act like a spreadbore.
I just want to hear other people's experience with them and I might bolt it on and try it.