I have a similar carb on my Huber 40-62 seat threads are different same needle and I have a choke but everything else is the same and not saying your floats aren't bad but I had a time getting my brand new floats set to a level that it would not flood the carb or the engine basically I found that the needle does not need to open the full stroke and it doesn't effect the hp because we Dinoed that old girl at 82 hp cold and about 65 hot so it's getting plenty of gas at the little the needle is opening. Hope this is of some help to you and as of new floats not sure because I got mine from Campbell and he is said to no longer be with us. Jason
http://www.acmoc.org/bb/showthread.php?16628-Carburetor-float-material-substitution
I bought the material but haven't used it yet