I can't seem to find any information, so help me please. Here is what I have. 1949 with a '57 235. New fuel tank, pump, carb kit, converted to 12V with a HEI ignition. It drives around town nicely (30mph), when i floor it, it takes off, but when i hit 40-50 mph and try to hold that speed it hesitates, bucks and dies. If i pull the choke about 1/2 way out it stays running and I can keep driving. I had the carb rebuilt by a friend of mine, I want to think it is a carb adjustment issue, but am looking for some guidance on this. Thanks.
