How many CURRENT owners of real '74 360 Duster 4 speed cars on here?

Mines an auto (not 4 speed) but it's a parts car (too much rot to try and save)
I just picked up one that is a factory car a couple of weeks ago. It's a VS29L4G, very nice with all original panels and a 3.91 gear. Perhaps you can assist me with something. When I drive it for a while and park it it seems to permeate my garage with an odor. I can't really say it's a gas smell, but it lingers for a while. Any ideas?

Thanks,

wight