Still catching up with all of your knowledge! The clutch is fine so I'm not going to change what is there until I need to. I tried to get the number you mention Rob but just couldn't find anything discernible with a highlight lens. Do either of these photos help to identify the gearbox? Looking closely today, I think the bell housing could have been "new" for the 2017 restoration, in fact it must be, it's just not dirty. While the engine is the original number could the gearbox be from another car? By the way, this was the damaged chassis!