Unless you are trained in rebuilding a carburetor I wouldn't do very much to it. If it's leaking gas externally it's probably the float or seat pin. I wouldn't do any more than replace the pin and adjust the float. That is simple enough and it will either work or continue to leak where you would need to adjust the float more.My 1979 CJ5 4.2L has a leaky carb and is fairly rough shape. I am not the best mechanic would it be better to buy a replacement or try a rebuild? I will travel to Iowa to pick it up from my sons place in February.
I used brass tubing from Ace Hardware to bush my throttle shaft.I would do a visual inspection first. If the throttle opening is worn, this could cause a vacuum leak and mess with your mixture and power settings.
There is not much you can do but ream it out and in a bearing for the throttle shaft.
It's real critical to keep the bearing sleeves straight. There is a tool you can buy for doing this.
That's why buying a new carb might be better than rebuilding an old one.