[RodKnock]

I've been curious about this topic for a while. If someone were to buy a Pond or Genesis block which have C5 casting stamps, with the present laws, could someone pass smog certification with the 1965 rules, at least for the time being? Of course, this assumes that the rest of the engine would be smog legal for 1965 as well. If this hypothetical engine were to pass and the law is changed subsequently to remove the year of engine rule, then would this engine and car be grandfathered under the old law?