That gas smell... any suggestions?

Simplest, quickest & easiest thing to do first is check your trunk seal. As you drive a vacuum or pocket is created just behind the car & the smells/fumes can come in through a bad seal & then easily into the car due to the way the Barracudas are designed with the dropping trunk divider. I did not think it would be that noticeable but my trunk seal was crap. I scraped it off thinking I had a new one in a box from the previous owner but it was not the right seal so I went a couple weeks with no seal. The smell was very strong. It is way better now with the new trunk seal. You will always smell some fumes/gas just due to using a carb, aged seals, etc. but the trunk seal drastically reduced mine. My 2 cents. . . .