Hey Coastie,
You are going to hate me!
but only because what I say might put doubts into your mind
Given what has gone on your motor it means you probably have small bits floating around somewhere. These bits are most likely to drop down into the casing to the left within your clutch area and maybe also to travel into your gearbox. If you drain the oil you might already find remnants in there on the magnetic plug.
In order to really make sure eveything is clean you will have to split the cases. You'll probably be lucky enough not to have any further damage and therefore the cost of parts for the clean up job is going to be negligable barring the seal kit. The cost then becomes only labour. You are unlikely to have to replace a lot of additional parts, if any, it's only about cleaning it all up. Considering what you already have to fix, it's not a huge amount on top, really.
Of course, you can simply replace what has broken, take the whole clutch side casing off and clean it out and then flush the engine a couple of times. I have used to very good effect an oil/petrol mixture as an engine flush which works really well - you just run the engine till hot, flush out, then take it for a ride with a new flush solution and then empty and put proper oil in afterwards.
The flushing will often get rid of bits but you will never know, because you can't get into each and every bearing to blow it out with a compressor or similar.
Either way could be fine but given the risk, it is entirely up to you. For the sake of an extra few hours of labour - on your part or someone elses, it might be worth the trouble.....
As for the rockers it always used to be the exhaust ones that went first. You'd be better off replacing them both and I'm surprised you can't get just the rollers, you always used to be able to.
Mail Dale directly about the cam as I don't think he makes it on here very often with his other commitments.
And by the way, these engines are fairly simple to work on. If you've not had a lot of experience, take your time, be really patient, double check all your work and use the workshop manuals available.
All the best,
Simon