UPDATE:

Today I installed the filter at the carb and ran a new fuel line to it.

I discovered something that may have been an issue. when I removed the fuel line adapter from the Carter I saw something in the threads.
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That is old pipe dope in the threads and as you see some of it was loose.

...I cleaned the threads with a brush...

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installed the new filter and ran the new fuel line.
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This time I did not use any pipe dope on the pipe fitting at the carb.

I did use a spacer at the horn as suggested to move the horn forward.

I hope that the loose thread dope was the issue. Ill find out next week when I take the truck to work.