Hey Ron,
Curtis is right... Go do a search on posts by HowardV.
Howard has an SPF with a 351. It's titled as a 2004 SPCNS without SB100, and the BAR determined that his 351 is from 1969. So he had to add all of the mandatory smog components (specific carb, air cleaner, PCV, etc...) to make it meet 1969 smog requirements. Since it's a 2004 vehicle and not smog exempt (iow: not SB100), he has to smog check it every two years.
This fits in exactly with what the DMV has on their web site:
http://www.dmv.ca.gov/vr/spcns.htm
Specially constructed passenger vehicles or pick-up trucks registered without a certificate of sequence are subject to emissions control requirements based on the model-year of the engine as determined by the Bureau of Automotive Repair (BAR) referee.
Using your example of a 1964 289, if the BAR agrees that it is a 1964 289, then without a Sequence Number, any SPCNS with this engine will have to meet 1964 smog requirements for a 1964 289 engine (which may be none).
Regards,
Randy R...
P.S. In the meantime, Howard was in line at the DMV on Monday and got a Sequence Number, so he doesn't need to deal with the smog tests every other year.