I have a 69 vert 350. I don't know if the cause of my overcoming exhaust smell is:
1) It's just a convertible and that is the nature of the beast 2) my exhaust is leaking somewhere 3) It's getting in through the firewall
The floors have been redone, but it is bad. Today, I got stuck in stop and go traffic and I really thought I was going to get carbon monoxide poisoning. It is worse when the car is stopped. But even at highway speeds, something does not smell clean. I would expect fresh air with the top down.