[Jack21]

Approach #1. The FFR guys use all late model Mustang running gear. Emissions don't seem to be an issue. Find out how they do it.

Approach #2. Most Cobras get emissions exempt through a variety of methods available in their State. Registering the car as an Antique, Classic, Specially Constructed Vehicle, or over 25 years old based on the year of manufacture of the engine block.

If your car is already registered, talk to your emissions inspector to see what exactly he'll be looking for.