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Slot racing in San Diego started to take hold in or around 1963 or so. This copy of the Pacific Telephone Yellow pages is from 1964, but the ads would have designed been ordered the year before.
Below in the Hobby section we can see that Lee's Hobbycrafts at 54th and El Cajon Boulevard offered a 90 foot track and featured "SLOT CAR RACING" on Friday nights. I hear that there was also a big Figure 8 track at ToyCo in downtown San Diego on 12th Ave, but there is no ad for that here.
1. Lee's Hobbycrafts
1964 Pacific Bell Yellow Pages
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In the following year (1965) you can see that there were several more places offering Slot Car Tracks and parts as the hobby began to establish itself.
So now we have:
1. Al's Speedway on Adam's Avenue in Normal Heights;
2. Arch's Hobbies in Hillicrest
3. Arch's Hobbies on 54th St and El Cajon Blvd. (they took over Lee's Hobbycraft)
4. Hal's Bike and Hobby Shop in the Clairemont Quad.
5. North Park Hobby Shop on 30th street.
6. San Diego Model Raceways in La Mesa
1965 Pacific Bell Yellow Pages

(click pics for close up)
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