Little update. I recently dropped my engine off to a guy that's raced and maintained Weslake & Nourish units for years.
I'm sure this is something I could have done at home, but I thought I'd call on the experience of someone that can gauge tolerances and assess wear and tear on these engines plus also give some guidance on setting it up properly when it's back in the bike.
Turns out, the internals have little or no wear and it looks to have been maintained just as its previous owner had said...... Result!
So, casings are all cleaned, new seals fitted, valves re-lapped, barrels blasted & re-coated black and it's being put back together with little fuss or expense.
Frames being powder coated and all seems to be on track for it to be done this summer.
Actually spent a couple of weekends tidying the workshop, re-organising benches and tools so I can't wait to start assembly.
Engine plates have all been sanded with superfine paper and polished to a mirror finish, which took me 3 days. Primary cover has had 1 day of polishing so far, which I didn't really want to do, but it does look good. If I would have had the engine at home neither the plates or workshop would have got that attention.