Because the Regal T-types and Ts were built on the lines with all the other Regals (and Olds Cutlasses) they were not considered all that unique. The engine/driveline package was nothing more than a package to GM. Their records going back that far are not well detailed with that level of minutia.
Basically, it is tough to determine how many XXXX color cars were built with the LM9 or LC2. Yes, we know how many Ts, T-Types and GNs. But many other details are more difficult to find.
My best suggestion for this type of data would be checking with Dennis Kirban. If he doesn't know, he will know someone that does. That is, if such knowledge is possible to have.
Find him via
http://www.kirbanperformance.com/