Guessing CE s Camshaft Engineering n Birubi st Cooparoo
That grind number is a Wades/Clive Cams ( Melbourne) grind
A close picture of the sdes of the lbes, and a measurement f the Base Circle Diameter, could indicate if ts a reground, a welded up lbe, or a billet cam. IIRC, it's a mildish grind, but still plenty good!
Tighes grind specs se their own unique numbering system,,,,,,,
The shims/no shims is an indication of someone has carefully ensured cam runs freely in the towers.
Rings are delcate items, and detonation can crack them, along with the ring lands on the pistons.
It'll have been a timing ssue.
By time you hear "pinging/knocking" the damage has already been done