A vented cap will spill everywhere, when you nail it full, it will come out.
Did they just fill in the end of the vent tube on the neck?
The reason I ask, on my 67, the vent tube on the filler neck is kinda long. I could see just drilling out the weld, or cutting a 1/2 inch off it. Still plenty of room, for a rubber hose to slip on.
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........I'm just learning as I go.......
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