Tracing Car History

[COPO 70 RS/Z28]

There has been some discussion on another thread here about documents. So I am looking for some help. I have traced the owners of my car back to 1980. I have been fortunate enough to talk to all of them, and have even received photos from 1985. Heres the problem. At 1980 the trail runs dry. I have a name but that's it I know the car was sold in Monterey from Roller chevy. I have tried a California vin search on the web but site seems to only accept more contemporary vins.

Does anyone know how I can trace ownership further back. I thought california kept pretty good records because the plates follow the car. The car was in california from when it was born until Dec 2007.

Any Help???

Thanks