Question for Holley jetting pros.
I agree with Snake's approach^^ because what you wrote here
I have the idle A/F set where I want it, but anything off idle
Off idle is still idle circuit.
Right now the carb has 72 primary jets and 75 secondaries.
Main jets take over somewhere around 60 mph, 3000 rpm depending on car, gearing, etc etc.
Cruise at 65 mph. If your meter still indicates it 10:1 then come back and drop the primary main jets two sizes to 70. Take it back out and see how much it changes. Repeat until the engine surges. Then slow down, drive hoime and go back up 1 size.
Its worth mentioning that I've seen some reputable guys on RFS post odd metering block configurations on some of the Avenger carbs. So without seeing the block, no way to be confident things will do as they should.
All that said, off-idle should be dealt with first. Get the off-idle where the engine likes it. Idle itself can be trimmed with the mixture screws. For off-idle, work with the throttle position on transition slot first. If that takes care of it, then you won't have to mess with idle feed restriction or idle air bleeds.
