We don't have the specific numbers of engines, etc., by DSO.
However, you can do a thumbnail estimate by cross-referencing the 390 production dates (beginning to end) with the B6 or B7 period, which wasn't too long. Ford, and the dealers association would sell "blocks" of GT/CS cars to the other DSOs. Then they would build them as a group, and send them off. Sometimes one DSO "group" would overlap with another. If you look closely in the 1996 Registry, one can see this happening.
As a general rule, GT/CS cars built in the 71 and 72 DSOs had more factory options.
How I miss B.C. I went there for the '86 Expo. The Mustang Club in Vancouver is a great group. The Spanish Banks show is incredible, on the beach!
Paul.