If the float isn't the problem, it may be that your power piston has become stuck or due to lost vacuum from warpage just isn't working right or it may not be working at all. This will allow too much gas to go up into the mast and that will let it run too rich (which naturally will foul up your idle). If you decide to switch to a Carter, you'll need a 2100s Carter (manual choke) or a 2101s Carter (automatic choke). It sounds like you're using manual choke now. I have a 2100s, but it is promised to another member here. I have a fellow looking to see if he has any in a warehouse he owns, but I haven't heard from him in a while. Alternatively you could use the 3211s (auto choke which was designed for 235 from 1957 until the end of production of the 235), but those are really hard to find and consequently more expensive. There were no manual choke 3211s models made. You may see some on eBay but those are mongrels cobbled together from incompatible parts. Any of the models mentioned above will install easily and without much alteration. You'll need the choke heat pickup tube extended, but that's about it. You should find the Carters more well-mannered and pleasant to drive. Good luck!
