If it has a 4 bbl intake with a 2 bbl adapter, then you can put a 4 bbl back on.
Though there are better carburetors out there, but I would put a small spread bore Holley on there because it's easy and it is similar to the 4 bbl's for that era car. Spread bore carburetors have smaller front barrels than rear barrels. A square bore has all four barrels the same size. Spread bore's will atomize fuel better at part throttle loads. Therefore, you'll get better response, drive-ability, MPG's and part throttle performance. However, spread bore and square bore units fit differently on top of the intake manifold.
Another secret to making a Holley on the street deliver both great power and mileage is one that has Annular nozzles/boosters instead of Down leg or Dog leg nozzles. Annular nozzles are superior to the other style boosters in their ability to vaporize fuel. The other two style boosters shine at wide open throttle but they make a carburetor a PIG a part throttle loads, and especially on either a small engine or a low compression engine with a BIG camshaft. Vaporization is what will differentiate a great carburetor from a poorly performing and gas sucking one.
There is an average of about 40 horsepower at street RPM's between a carburetor with Down leg boosters and then taking that carburetor, removing the down leg/dog leg boosters and installing the annular boosters. The difference in the manners of the engine is night & day. I've also seen upwards of 5 MPG gains that way, too.