Holley stumble trouble

OK. I mentioned it but didn't link anything because I was trying to keep focused on normal, basic stuff.

I'm borrowing this photo "Tuner" posted here on RFS.
It shows the emulsion tube removed.
106_434eeb186c86f9dc01c34448312395da.jpg

Unfortunately, some blocks were made with the hole for the emulsion tube even though they didn't have.
Air can be introduced into the main well either through a tube, or through drillings in the casting. but not both!

When the connecting hole for the tube is in the dogleg but there is not tube, sometimes weird delays occur.
After Mike and Tuner discussed this problem, I went back and fixed my 650 VS.
So here's another thread on it, along with my attempt to explain the issue.
Another dogleg kill bleed carb - list 80783, 650 VS

However before jumping ahead, lets make sure there is no tube. If tops of the wells are plugged with caps, theat will be another clue there is not tube.
Sometimes the bottom of a tube is visible when the jets are removed.