Hi,
Thanks for the advice. My studs were threaded long enough so I did not have a problem with the shoulders, but I did yank off the adapter again and it was definitely warped. I layed it on a flat surface and it rocked back and forth. I found a good used adapter and it works fine. The vacuum leak is solved. Thank you everyone for your help.
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I chased a similar problem and ultimately found the threaded portion of the stud was not long enough to allow proper tightening of the carb to the manifold. I would think I had everything cinched up tight and everything looked good, but it was only cinched up tight to the stud. It is easy to check, just remove the front nuts and look to see if you can see the shoulder of the stud.
Jay
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