I bought a set of 340 cams that another FABO member had custom grind off the factory specs...
One 340 Auto - the standard small block 4 bbl cam from 69 and on for every factory small block with 4 bbl...
Then one to duplicate the 68 340 4 speed cam, which was a one year only cam... Chrysler made the automatic cam standard after 68 because some people complained it was too rough....
The one that I bought was 6° off on the intake center line and lobe center, but Ken Hoard was able to "bump" the intake lobe so now the lobe center lines and lobe center are right on where the factory spec is... Ken at Oregon Cams made a "master copy" that he can now use to make others....
68 340 Auto cam:
268/276 Duration, .429"/.444" Lift, 44° Overlap
68/ 340 4 speed cam:
276/284 duration, .444"/.453" Lift, 52° Overlap.
Pretty much most cam manufacturers make a version of the 340 Automatic cam, but not the 4 speed cam....