Carburetor—Gas Mileage

I have a 1080 Pinto with the 2300 4 cylinder engine, with automatic transmission, that came from California with all of that state’s pollution requirements.  I have removed all of this pollution restrains but find that I am getting terrible gas mileage, maybe 10 miles per gallon.  The carburetor is the stock 2 barrel Holly/Reman.  With this I am thinking that maybe I need to change carburetors for a 2300 engine that came from another state or a stock carburetor from an earlier year model when pollution control was less.  Looking at parts lists there appear to be different carburetors used on different year models. Therefore, I am asking what other owners might recommend, and if another stock carburetor would improve my gas mileage what year/model carburetor should I use?
Reply to Lesterwa at
Wes Jones
wesjones98922@yahoo.com

 Try turning in the mixture screw and see if it will cut the motor off. If its not cutting off the gas, you probably have a ruptured power valve diaphragm.