It has been a few weeks now, but (after searching through on-line pictures) it was a spyder and looked like a 908/3 or 908 Kurzheck -
flat/vertical sides, open center cockpit - I am embarrassed that I don't recall whether it had the vertical fins of the 908/3 or the spoilers of the Kurzheck, but the pictures of the fins on the 908/3 seem taller than what I remember, so a Kurzheck is possible. (The sides of the car were definitely vertical/flat, so I am pretty sure it wasn't a 910.)
I did find one link claiming that 908/3 chassis #17 was owned by Mark Leonard of La Jolla, in case that rings any bells. Another link says he ran it at Laguna Seca Historics in 2000.
The funniest part was following another link and winding up on an online post of a November 1998
Windblown Witness article by Wayne Baker that mentions Mark Leonard.
Ok - real-time update. Searches on Mark Leonard leads to "Grand Prix Classics" in La Jolla, which leads to:
http://www.grandprixclassics.com/cars_sold.htm
- and, voila, under Porsche is a pale blue 908/3! That is the car I saw on Via De La Valle.
Ok, enough of stream-of-consciousness Porsche fun - back to work.
![Rolling Eyes :roll:](./images/smilies/icon_rolleyes.gif)