Ticking noise, 383, can't locate the source

#1 exhaust.
A very small mark on the rocker, I don't see anything on the retainer.
Looks like it was rubbing on the very edge of the retainer, but no evidence on the retainer.

Same for #3 intake.

None of these are in the pics above because it sounded like it was coming from the rear.

Is this enough for a ticking sound?

I'm thinking if I pulled the other side I'd find the same thing on at least one rocker, but I don't hear it there.