You didn’t mention power valve opening, but it’s important. You need to hook a vacuum gauge to manifold vacuum (not ported vacuum like is used for a vacuum advance distributor) and drive the car while monitoring the gauge. See what your vacuum is at a CRUISE and then set your power valve opening by that. I suspect you’ll have 16 or more inches at a cruise. That’s means unless you can find something that opens higher than 10.5 inches, you need a 10.5 power valve.
Do not set your power valve opening by idle vacuum. That’s wrong. Set it by cruise vacuum.
I am by no means challenging you but I was taught and have read to do the opposite IE: set the power valve 1" or so below the lowest vacuum reading in gear. The reasoning was that the power valve could / would otherwise open when idling in gear casing an overly rich mixture. So could you explain the theory / reasoning behind your method ?
And to the OP glad you have it on the run
