Reviving the Dart Lite for daily driving...how should I spend the $$$?

Immediate Needs:

Fix a leak on the top of the gas tank (added a sender for aftermarket fuel level gauge that is leaking) No cost.

CARB! I have been through this carb a million times. I replaced it with another carb. Both rebuilt with basic parts store kit. I have had NOTHING but trouble, float sticking, leaks, accelerator pump linkage, etc.
Carb is a 1945 (I think) with the base, main body, and top hat (like Thermoquad).

I need to do something with induction. Either find a GOOD 1 bbl carb, or go to a 2 bbl setup.

Presuming I can get these 2 things remedied, I can drive daily. Brakes and fluids will be checked, etc, but I do not anticipate any issues there.

What are you recommendations on how to proceed?

HEI mod?
Electric fan?