Sorry your right! I missed the SC differences.
Can a NA head be used with the SC cams swapped over to it?

These guys are RR folks but offer a wide range of rebuilt JLR engines.
Might be worth a call to see what they recommend?
Range Rover Engines
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I think the item you are looking at which is damaged is the valve guide which just taps up and out after the valve is removed. Should be easy enough to replace. I just took this one out of my scrap head so you can see it clearly.

 

Cool. Thanks. Nice to see what it looks like.