[Bob Mulry]

Here it is...……

From 2019 NHRA Rulebook Section 11A, page 3

CARBURETOR
Must be correct year, make, and model specified for car’s engine;
fuel or air bleed passages may be resized. Drilling idle holes in
primary
throttle blades permitted. Other modifications prohibited.
Sandblasting, grinding, flash removal, dry film coating, or any
other modification to carburetors prohibited. Replacement
carburetors permitted provided they are same model, type,
throttle bore, and venturi size. Computer carburetors use latest
model non-computer carb for engine application.

It also doesn't say that you can poke a sharp stick in your eye....

Unless it states that it's allowed, it isn't...

PS:
This is also the rule for Super Stock....