1968 340 AVS 4425S carb problems

I reading this post and I see discussion on the 1968 Carter AFB.
Do you really mean AVS?
After 1967, the only Chrysler cars to have AFB's were the Hemi engines and they had the two "fuel" idle mixture screws.
When the Carter AVS come out in 1968, it had the upper mounted single, left hand threaded "air" idle mixture screw. The two lower mounted factory set "fuel" screws were behind the lead plugs.