Stuart I take it that those valve clearances are with the engine cold?
Stephen, you likely know the folks here:
https://www.indianprince.org/ohv.htm
...but just in case you haven't run across this website you might find someone there with the clearances.
Thankyou Harry a very useful pointer,I have had a look at the site and potentially a useful parts source as well!
Interesting to read that Bert Munro had a spell of tuning 350cc Princes for grass track.
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