I'm an ex dealership technician and fully intend to do the rebuild myself
I've got a later M95 box and intend using it to stand in for my M93 (best ratios)
Then I'll rebuild the M93 over a couple of winter nights
At the minute I'm sort of dickying up an adventure in my garage actually I'm near enough restoring the bloody thing cos my mate (the owner) can't be 4rsed to wash it so I'm gonna be spraying forks lowers, fork bridge, front wishbone, engine casings and all sorts of things in the next while!
So many Oilheads so little time!!!
Something else to be aware of if you change a box the later M97, uses a different final drive ratio so if ya fit a later box you screw up ya speedo and mileage!