The Zenith 11275 should work extremely well on your 235; however I might suggest trying a different setting before rebuilding. Try setting the idle mixture control screw at 3/4 turn, and the high speed mixture screw at 1 and 1/2 turns (set both after the engine is warm and the choke is off); then adjust your idle speed with the throttle positioner screw. This should lean out the mixture to where the engine will not stall. If not, then time to rebuild the carb.

Jon.

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop