Paging @SteveKen
I'm testing the mesh of the starter, but doing so by pulling out the pinion manually. I don't want to test crank and turn it over as I've got the crankshaft locked and the cams are out while I wait for the replacement tensioner - but I do want to button all this up and get the gearbox on. Can you eyeball this and give your blessing:
The pinion teeth find their place at about half way in. As best as I can tell (by examining the scouring on the stock ring-gear, that's about where things were with the stock-starter/auto).