[JayBar]

My BDR also made the garage smell of gas. AS has been said it's part of owning a Cobra. But I did change two things, not for the purpose of stoping the smell but for other reasons.
I shortened up the tube from the filler cap to the tank. I made it as short as possible. This stoped gas from pouring out of the top when I gassed up and also allowed me to fill up the car with another 6 gal's of gas.
Then I got rid of my Holley Street avenger with an electric choke and went to a double pumper with no choke.

Then one day noitce the garage did not smell of gas. I can't tell you which mod did the trick but I would lean tward the carb.