Vented gas cap?

gm1236 said

The flange is on the outside of the body. Makes it easy to get the tube in with the tank bolted up. So on the early cars what goes in first, the fill pipe or the tank? I think there would be enough room to move the flange inside. Just have to drill some new mounting holes opposite of what it is now.

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You mount the tank, then with the trunk floor gasket pushed up the filler pipe you push it in the tank gasket (giant grommet). You push it in further than it usually goes until you clear the trunk lip then pull it out into the quarter to mount. There is enough flexibility in the tank grommet to allow this. Then you slide the trunk floor gasket down the filler pipe to seal, and then you wrestle with the vent tube to get it in place (kind of like a tetras puzzle).