[What'saCobra?]

Don't worry, you are not flowing 1320 cfm, but the carbs are supposedly capable of that rate, if everything on them is perfect, the moon is in the best position and you have at least standard conditions.

But, if you are going to race up MaunaLoa or whatever, 68's might be OK. At sea level, it all depends on your exhaust temperatures, particularly on the most distant ends, left and right. I would always prefer to know exhaust temps real time. Drill a hole in one and stick a sensor in there, make some runs and watch the guages. But the O2 sensor can tell a lot also.

Pistons are not terrible expensive, but a pisseur to buy just one if you have a unique set-up and you didn't buy 2 spares at the time. And the piston eats other stuff if it really lets go rather than just holes.

Jerry is right, there is a set of Nitrolyte floats that are shaped to reduce the excess float "sink" when decelerating in a corner. It doesn't happen when accelerating because you are open throttle and full on the main jets. The lateral axis accelerations are the problem when the fuel starts to climb up the bowl wall and the average fuel level in the bowl, as measured along the old float axis, drops, causing the valve to open and admit excess fuel. Again a good idea which tries to correct a serious problem caused by a lousy (for road-racing) initial design in the first place.

By the way, some folks have no problems because their cars don't generate enough lateral G's on their street tires. Race tires and genuine race driving really raise the ante and will demand a more thorough solution.

With that super tight linkage and no lash you would be surprised at how much excess fuel was dumped in the manifold, particularly if you could see how much the engine really moves left and right on its mounts as you slam and jerk the drivetrain around and transition from downshifting/braking each gear then back to WOT.

Lot's of good ideas today.