This is crazy and random but I was watching the new Chips movie, based on the 80's TV show with Eric Estrada. Anyway! I looked up the original show on IMDB (internet movie database) and the first picture to pop up is this one with a yellow speedster.
It looks like Ralph Ricks speedster to me except that I think his had black fenders instead.
Also, here's the link to where I found the picture.
At first glance I was going to say RDRicks also, time frame would be about right. Ralph later converted it into a pickup truck and caught hell when it was painted a sic, pea green color.
The speedster belonged to Ken Keesee of Anaheim, CA. It was built in the early 1970's, and did run at the Shell Hill Climb a couple of times. Had a Rootlieb body and Pasco wires.
Mark- I thought that was Ken Keesee's speedster. I remember Ken and his Model T museum very well. He had a great collection of cars. I know the collection no longer exists but is Ken still around?
Unfortunately Ken passed away in January of 2016 at age 87. The white touring you see the tail end of in front of the speedster was also Ken's, a 1910.