If the cam is that "old" you can bet it's a billet blank... I think the pressed on gear drive is a "late" advanced feature.
Glad to hear you're running the zinc oil although this is thought to be important (as in HUGE) for the flat tappet guys - it does also help for break in of parts like the gears we're talking about - and the "cam boys" all recommend a break in period using a high zinc style oil for that purpose.
See ya soon buddy -- so keep 'er running! No excuses!
