The Rochester B's with manual choke for the 235 are difficult to find. Most of them have been thrown away over the years by disgruntled owners. The remaining units are in demand by a few individuals that want them for dual set-ups (easier to deal with the manual choke on multiple carbs). As far as the Rochester B's with automatic choke, we have been trying to GIVE them away for years, with little success!

http://www.thecarburetorshop.com/Free_carbs.htm

Carter manual choke carbs are almost as difficult in the 235 size. The manual choke 216 carbs are available.

The 3211s Carter (Auto choke) replacement for the 1957-1962 235 engines are available.

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