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OK here is my take.
I had an original 70 LT-1 for 27 years, with the original carb, I raced it, and that carb gave me fits. I had to send it back to Holley for them to fix.
This is what caught my eye on your carb:
That looks like a brass plug to me.
I would like you to tap on it to determine if it is metal or putty.
A factory production line carb would have putty there.
A CE carb is not drilled there.
Yours may not match either scenario.
I would like to see the air bleed.
Then take a pic straight down into that choke showing both that "plug" and it's adjoining air bleed, like this: This is a CE carb, not OEM, and has a normal non drilled housing and a normal brass air bleed at that spot.
