I know it won't be completely possible, but this is my best effort.
Here is the engine.
All seals replaced with genuine Honda ones.
NOS camshaft
NOS cam chain
NOS cam chain tensioner
NOS cam chain guide
NOS valves
NOS rocker arms
New rebore, valve seats cut and valves lapped.
NOS piston, rings, clips and pin
All bearings changed for NOS (except crankshaft and mainshaft)
NOS kick starter spindle
NEW kick starter spring (not NOS)
NOS balancer chain
Engine painted in 2K satin black.
All zinc parts re-plated.
There are probably lots more new/NOS bits but I can't remember.
It's my first engine rebuild, so I'm expecting there to be problems when it comes time to start it

Many thanks for all of the advice that got me to this stage, especially from Gunnar.