[JL8Jeff]

There are emission's standards going back to the late 60's cars. That's why they installed smog pumps on cars starting around 67. So if your engine isn't stock then you might have some problems passing the sniffer. Check with a local garage that does emission's testing and they might be able to "tune" the car to pass. If it doesn't need to go on the roller dyno you can probably tweak the timing and carb settings to pass.