I suppose the set I have could adjust +4 or -4 degrees If I wanted to reset it all. But since it's running well, I don't see the point in pulling off the cover....spending money on degree wheels and $40 on new seals to reset it. Plus, in my experience, you never get quite as good a seal when you replace the cover with Oil pan in place, as you do when you put cover on first, and then install the pan like I did with engine on the stand.
Your advice has given me quite a bit to research and ponder. I've got a buddy whose 318, '88 d-150 just crapped again.......might be a plastic tooth chain issue, so I will get a chance to mess around with Cam settings again soon.