I know there were more than two 340 camshafts. There were 2 differant ones in 68 alone. Then 69 had a differant one and 72 had a different one.
If someone wants to discuss this I guess I can pull out all my manuals and start looking through them to get the specs on the different 340 camshafts for the different years but as it stands right now I'm not going to do it.