Yeah, pity you can't put pictures up.
General comments here:- (based on my past experience with 4 cylinder Mitsu cylinder heads)
Rough appearing surface on cam bearing surfaces is normal after a chemical wash. Helps retain lubricant.
Likewise, some small surface scratches on the cam and lower bearing surface is to be expected. Heavy grooves though are a problem. (Can be line bored)
Don't use any sort of sealant between the mating surfaces of the bearing caps and head. (Unless the manual calls for it)
Make sure everything, especially the mating surfaces, are completely clean.
Use a torque wrench on the cap bolts, and in the right tightening sequence. (Check if the bolts go in dry or oiled)
Use a cam lube on the lower bearing surface. Drop the cam in, then a small blob of lube on the cap bearing surface before you put it on.(The alloy of the head and cap are the bearing surfaces, no special surface treatment.)
OK to put cam seals in before you tighten the caps, but you could risk getting sealant onto the cam itself or between the cap and head. Or even into oil passages if the seal is near a cap that carries oil to the cam and lifters. (Probably safer to install them after caps are torqued down)
IF any of this is incorrect, I'm sure Mal will sort it out in his usual informative style.
