Ah. OK, now I get it. (note to self: ask interior guy about intentions re: glued down carpet). Plus you're in a '63 Vette. Nice car, btw.
So ... not much I can see to do. If the gas that escapes the tank via the vent line doesn't have a way to return to the tank, then eventually it will make its way to the outside. Twin Sting's idea of using the OEM technique of routing the gas/vapor to the intake manifold and burning it may be the only solution you got.
jp
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