Ah, sorry, hadn't realised the engine hadn't actually been checked over at this point.
Unless it's a hideously expensive engine, I'd be tempted to just go down the replacement route, it's usually faster and less expensive in the long term.
Don't forget, if doing a valve swap, even if nothing else is immediately damaged, (unlikely, but possible), at the very least you've got the cost of gaskets, and if anything like most cars since the nineties or so, new head bolts. Plus cam belt kit, or whatever. Then there's the time needed to strip and inspect everything...
Also, depending how the valve gaps are set on that engine, if it's not got hydraulic tappers, or an adjustable setup, you may need to purchase fresh shims to set the new valves up
The valve guides are a sepperate component, typically pressed into the head, so the head material alone won't tell you if they're soft or hard types. If replacements are required, it's not really a diy job for the novice.