Hi Gerry,
Usually the wear on cam and followers is accompanied by scoring, usually theres a ridge at one side of the cam or followers where they have not been rubbing
Case hardening would be probably 40thou thick (1mm)
As the cylinder has been skimmed make sure the pistons do not hit the head gasket
Inspite or despite of all this I'm still puzzled why it was not running evenly ???? unless the inlet cam was completely worn away
Cam dimensions depend on which cam is fitted
Cam wear will occur rapidly as there are two hard surfaces involved
small end bushes and so on have a soft bronze bush and a hard pin, they will survive on remarkedly little lube
The cam trough is filled by oil when the prv opens usually when cold at start up , as the engine is runniing oil is thrown from the crank to add to the supply
Did you recon the oil pump? and have the prv checked??
HTH
John