@italford-huh WHAT?! Prior to '73 there is no smog equipment to make a requirement therefore a car is in compliance. '74 an '75 are the only issues....Secondly you only need to comply AFTER the law changes. As it stands now you can run what ever you want on a pre '75. When, if, the law changes you will need to change back to the stock smog polluting setup.....Exempt DOES mean you don't have to comply when there is nothing to comply TO.
I've driven most of the central Cali area (San Francisco to San Diego) on a regular basis over the last 8 years and have NEVER seen a roadside smog inspection area. Is there an area where these are predominatley located?