Need recommendation for a Carb for better MPG!

biggies to look for on TQ's

Excessive throttle shaft wear

Metering rods piston free and not excessively worn

The adjust screw for the depth of the
rods frequently is corroded and breaks off
The center plastic body for being wrapped and cracks. My dad's TQ had cracks in the mid section, the carburetor shop that found it said that those carburetors were known for that, is that true? I don't know as I was around 17 at the time