As Mumbles stated, if you’re lucky enough to own the timing fixture with the flywheel nut finger tightened, problem solved.
That is normal on that motor. The flywheel holds the cam down when installed. You can adjust the points thru the hole in the flywheel OR fabricate yourself a “tool” to hold the cam down. A piece of some sort of tubing will work. I think I made mine from a piece of electrical conduit.
I’m thinking that this involves a flywheel nut inside of the conduit, with the conduit extending beyond the flywheel nut far enough to hold the cam in place. Is that the setup?
Maybe a tool could be made from a fine threaded hex spacer, by boring out some of the threads. I guess it would depend on the OD of the spacer. It would have to fit over the crankshaft.
Without going out to the shop to look, I’m pretty sure I used a piece of EMT conduit. It wouldn’t slip over the key so I cut a groove part way up the side so it straddles the key. Flywheel nut holds it down. Hey, it was a matter of need at the time so no need to make it fancy. Afterwards, it still filled the need, so never did get around to making a fancy one. Well, I guess I did make some “fancy ones” when I made timing fixtures. Richard White is da Man now.
.
.