Did you actually look at the pictures, and read his comments? Those holes are pretty bad. Once you punch through and chip, you will be severally limited in your ability to get the idle mixture right and balanced. The idle mixture screw for your carb is the 30A-80 which is the same screw the hemi carbs used in 66-67. Also some other AFBs. The Hemi idle mixture port is a #52 drill bit .0635-" in measurement on several I calculated. This is the correct dimension for stock Idle mixture screw 10-32 x 1.430 (.080 dia x .645 L blunt tip, grooved head). So you could remove the idle screw, measure actual opening of the port.
There are 10-32 screws that have larger diameters needle shaft and it may be an alternative to use them as a stop gap. Off course you may have a sensitivity issue with a larger bore dia. I find it interesting the bleed down stopped. You stated you poured liquid into bowl and it drained down to jet level and liquid was in secondary bore. Primary issue complicates matters, but that would not be the source of secondary liquid on the bench.
I am not as familiar with Max Wed as the hemi carbs, but the 413 got the 3447 and 3505 carbs, the 426 got the 3705, 3861 I believe. Supposedly AT 3705, MT 3861. Seem like there are plenty more 3861 around. Jetting is the only significant difference. The Primary and secondary venturi are the same. So that could be an alternative for you.