As previously posted, changing valve guides isn't a normal DIY job. There's nothing difficult to it but you do need an oven large enough to take the head and raise the temperature to 100/150C, plus a freezer for the guides. So if you're doing that you might as well change the valve seats as well for something more suited to modern fuels and that means you need a valve seat cutter as well, not something you normally keep on the DIY shelf. So like a re-bore, it's a machine shop and in the case of the head, one that knows what it's doing.
But everything else is DIY and not difficult, if you get stuck then just post on here because many of us have done these jobs before.
Changing cams is easy enough but laborious unless you just happen to have a stock of the shims on hand because you're certain to need some new ones. That's the advantage shops have, they'll have a shim bank but even so all I did was measure up and order a new set from Burtons which came in a couple of days. The other aspect is if you need to alter the carburettors, webers/dellortoes are usually easy because so much is known, but if yours is on Strombergs I think you might need a rolling road or at least a wideband sensor + meter.
As an aside, your patience is amazing. I get that good shops have a long waiting time but 7 months is getting silly, it's almost in the "who's that belong to ?" category now. Maybe asking for the parts to be returned will spur them into action but if not then I'd also be looking for alternatives for the head work.
Brian
