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

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

could it be an exaust leak? I know I smell them after driving cars in and parking them in the garage.