I have dug out my 22G846 gearbox case and I'll need to build it up to support and handle the power from my 1360 BMW twincam engine. I hope the engine will make over 100bhp and I plan to tune it for torque, I will be running a 3.1 or 3.2 FD and a Quafie ATB (LSD). It will be a daily driver so no SC gears but I do like longer gears, (I don't want to be in 3rd at 40km doing 3000rpm )
From memory when I disassembled it I found broken teeth on the laygear. How do I find out what gear ratios the originals are
Should I upgrade to a different, stronger gear set cluster/is there a difference
What are peoples suggestions?

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Respect mine and I'll respect yours.

Thats an elf box? Do they take the standard 22G927 4 syncro laygear?

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1963 Morris 850 Smoke Grey
1963 Morris 850 Shadow Blue
1965 Morris Mini Smooth Van
1966 Morris Mini Van
1969 Morris Mini Deluxe Resto
5/72 Clubman Gt

Yes they will
with a little bit of fiddling around you can use the gears that are commonly called A plus gears if so desired I am talking about the internal gears not the drop gears, however even that can be achieved with a fair bit of work.
I am sure Dr Kev will be able to advise you further

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" A Hundred Years From Now It will not Matter what my Bank Acount Was,
The Sort Of House I Lived in, Or The Kind Of Car I drove ... But The World May Be A Better Place
Because I was Once Important In The Life Of A Child"

I have the same box under my 1360. Treat it as a 1128 box. Same same.

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The bitterness of poor quality (or Crappy Workmanship) remains LONG AFTER the Sweet Taste of Low Price is forgotten.

Can you fit a 4 syncro rod change gear set into this case?

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Respect mine and I'll respect yours.

If its like a 22G1128 then yes. Only the reverse gear is different.

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1963 Morris 850 Smoke Grey
1963 Morris 850 Shadow Blue
1965 Morris Mini Smooth Van
1966 Morris Mini Van
1969 Morris Mini Deluxe Resto
5/72 Clubman Gt