Hey, I just happened to think of this. Tom Olson posted that he had raced with Truman & helped him work on the '68 Bird Truman got from Roy & Mike McKinney.
Also said that after Truman moved, Tom himself built a '72 455HO powered Stock Bird.
http://classracer.com/classforum/sho...&postcount=449
SO, if they worked on Truman's car & raced together, it makes sense that they MIGHT have discussed the '72 Pontiacs that Truman had raced. Therefore, he MIGHT be able to clear this up for us, or at least provide more info.
I sent him a PM, so we'll see what he knows.