need help

JB Weld on the carburetor sounds absurd. It doesn't even resist gas.

I used it to re-glue the jet wells on a Thermoquad and drove it for several years until the throttle shaft was too sloppy to keep running.

I also used it on a 2280 Holley where the fuel line goes in. Fuel bowl was almost stripped out. Ran that for a couple of years on my slant.

Time to set valves and do a good basic tuneup.