I just did this carburetor swap, but have not run the engine yet. My stock air filter fits snuggly. Check the clamp and make sure the ends are at 90 degree angle to the base and not bent towards each other. That might get you enough to be tight?

~ John in Utah
1946 1/2Ton w/4-speed manual transmission w/1960 235 engine
Here We Go
Follow in his DITY Bay

- If you think about it, it has been one year ago today!