This article has a few things that I cannot confirm or deny without finding my manuals. But he is saying that the 72 340 had a smaller camshaft than the others. And then he says that the 73 340 brought back the 68 automatic camshaft
I didn't read it that way. All I see are TWO grinds brought up. Where he talks about the manuals, he is talking about the 68 only 4 speed camshaft, I believe, although he does not specify that. That's the only other 340 camshaft that "I" was aware of that was different than "all" the rest. It was my understanding that it was all by itself (the 68 4 speed cam) and then all the "other" 340 cams past 68 and the 68 auto camshafts were all the same. Clearly, if you have other info, I am probably mistaken, but like I said in my first post about it, this will be the first I've ever heard of three or more 340 cam grinds. Everything I have ever read or heard people talk about there were only the two. I'm certainly interested in anything you have that shows otherwise, cause I'll be learnin somethin new.