MW/Gilson tiller

A little off the tractor topic- I'm sorry, but it is small engine related.

I have a 1974 Ward's tiller that was rescued from the boneyard. The engine is a 5HP Briggs horizontal shaft. The engine runs well and doesn't burn any oil, etc, but the carb is in pretty bad shape. It is the old diaphragm carb that bolts directly to the gas tank. It has the old plunger style choke. Is there a rebuild kit out there for this relic, or should I replace it with something else?

Also- how do you set the govenor linkage on this beast? The govenor linkage was disturbed/removed, and I don't think it is back on in the right place. Controlling the engine speed is pretty dicey. Full on or nothing...

Thanks in advance.
John