Hi Dave,
the parts are all Honda items.
The engine doesn't need removing from the frame to fit these parts.
If you are not that experienced with the spanners it might be better to trust installation to someone better suited.
The clutch and gearbox has been used five times by me. 12 races in total. Say, 200 miles max allowing for a crash and piston failures.
This set up won a few Derby Phoenix races, including an open 400 race against TZ's and RS's! Okay, it was in the wet, still won though!