I didn't respond to this because I thought Allen Brown would...if you go to the following:
http://www.oldracingcars.com/f5000/races.asp
and go through the "US 1969" and "US 1970" races, you'll find he did a number of races. In 1969, he drove a Lola and in 1970, a Surtees. I remember being quite excited to see him at Seattle because I'd read about him the '50's. I THINK the Lola was yellow, but I'm not sure.
In one race in the '70's, the entrant is listed as "J & B Racing, Phoenix, Arizona". The 1969 Seattle results in the local paper listed him as being from Scottsdale, Arizona.
Vince Howlett, Victoria, B.C., Canada