To Honker:
I think your posted photo is from the Tucson races....
To Richstang: Here's a link to the "blueprint schedule" you mentioned....also a poor copy (jpeg)(need to scroll down the page to see the blueprint):
https://www.drivingline.com/articles/davey-jordan-and-the-shelby-toyota-2000gt/I think this is the tentative schedule noted in the "blueprint schedule"....the ones in the boxes and arrows are the ones most likely attended:
Las Vegas-February 24-25, 1968-Southern Pacific Division
Willow Springs-March 9-10, 1968-Southern Pacific Division
Tucson-March 30-31, 1968-Southern Pacific Division
Stuttgart-April 20-21, 1968-Midwest Division-blueprint shows this as an added race in hand drawn box
Kent-May 18-19, 1968-Northern Pacific Division
Road America-June 15-16, 1968-Central Division
Orange County International Raceway-June 22-23, 1968-Southern Pacific Division-blueprint shows this as an added race that is hand written in...I don't know if this race happened on that particular date. There was a Scca National race on the following weekend (June 29-30 at Orange County).
Lime Rock-July 6-7, 1968-Northeastern Division
Bridgehampton-July 20-21, 1968-Northeastern Division
Riverside-August 3-4, 1968-Southern Pacific Division
Mid Ohio-September 7-8, 1968-Central Division-blueprint shows this event is just circled
San Diego-October 19-20, 1968-Southern Pacific Division-I think this race was cancelled and rescheduled to happen at Phoenix instead on the same date though on the Scca National schedule (although crosslinking with another site has this event happening on the 12-13th of October....so you might want to check that date also).
Riverside ARRC-November 22-24, 1968-
Many of the internet articles mention that the Toyotas were also raced at War Bonnet and Odessa...no dates are listed. The Scca National schedule for the Odessa National (Southwest Division) race September 14-15, 1968 and the War Bonnet Scca National on September 1-2, 1968 or October 5-6, 1968. The following link shows a photo from the San Diego Stadium National race (possible date as July 20-21 (this interferes with the Bridgehampton race) or the Regional race on October 5-6.
http://johnstraub.blogspot.com/2011/03/toyota-2000-gt-day-japan-broke-mold.htmlThere are no noted races in the Southeastern Division, which would mean that the Toyotas did not race in all "7" divisions during 1968, unless your research shows otherwise.