Ticking noise, 383, can't locate the source

I see different wear patterns on the rockers/rods.

Some rockers have a circle just above the hole, others show wear just below the top of the hole to the center.

Intake or exhaust, doesn't matter.

Also, they all have weird casting marks, I guess, two almost look like cracks but are not thru, one is level across it, the other one side is a bit higher on one side.

I don't think they're cracks though but I've been wrong before.

And I noticed the machine shop obviously made clearance for the pushrods.

Just wanted to give these another look before I slap it back together.