My 68 has all the old emissions including smog pump. I have not really observed much difference between CA and the rest of the country for emmissions in the 67-72 series. There may be a difference though. Certainly in later years there were different requirements.
There are some variations in smog components depending if it is an automatic or manual transmission equipped trucks. Also 1/2 ton trucks seemed to have more smog stuff than 3/4 or 1 ton trucks.
Check out the message boards at
www.67-72chevytrucks.com if you have not already. Someone may be able to help you out.
