Jay Carnine (C9) sent me an e-mail outlining his solution. First, he recommends running a hard line up the inside of one of the fender wells (inside the trunk) and back down. Both the entrance and exit should be under the car and outside the body. Connect one end to the vent. The other end can be open to air or fitted with a simple slip on filter.

In his roadster, C9 also installed a small charcoal filter and ran a line to the air intake on his carb.

I am going to try the high loop without the charcoal filter. If gas fumes in the garage are a problem I will conside the more elaborate solution.

Vintique gave me a strong "don't do it" when I asked about drilling a vent hole in the cap. Said I would always have a little gas running down the outside of the filler neck if I did.