The top of the air horn on the 3211s differs from that of the 2100s.
Have never personally tried this, but I believe the 2100s would work on the 60~62 235's by using a different air cleaner.
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