Tim - something to always consider with the Holley type AA-1 carb:

The economizer valve (a.k.a. power valve) which is made from neopreme, is located in the bottom of the carburetor bowl, and has a direct passage into the intake manifold. If the economizer valve fails, the bowl is drained directly into the intake manifold. If you are forced to use ethanol-based fuel........

Jon.

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop