Before making any decision on the existing carb and governor configuration, some homework is in order.
Transmission gear ratios
Rear end ratio
Is the rear end a 2 speed
REASONABLE engine red line
Rear tire size
Now maximum safe speed for each gear may be calculated.
Should you opt to retain A governor; Holley, Rochester, Stromberg, and Zenith all offered 2 barrel carburetors with INTEGRAL governors.
The integral governor is a part of the carburetor throttle body, rather than a separate unit.
While none of the afore-mentioned units are inexpensive, all (opinion) are more reliable than the sandwich unit (for which parts may or may not be available). (Opinion) the Rochester, Stromberg, and Zenith units are MUCH more reliable.
Homework can save you a BUNCH of money over impulsive purchasing.
Jon
