The clutch is off, I still have all my fingers and nothing was broken in the process.
Remember - this thing hasn't turned over in 40 years.
One clutch friction plate was still stuck at the back of the clutch basket and try how I could, it wouldn't come out.
When the clutch basket was off, it had to be tapped off via the holes in the back.
I made up two pieces of steel plate, interlinked them and attached them to the clutch 'spring' studs.
Got a puller around the plate and pushed on the gearbox mainshaft. The cush drive was rusted onto the splines
and frozen in place.
Winding the puller center bolt slowly pulled the cush drive off.
Once the primary drive and clutch were off, the tapered drive piece was left on the gearbox shaft.
Putting the puller on that, and winding it up real tight, then rapping the center bolt freed it up. It
shot about 5 feet across the garage with a 'crack'.
Nothing broken. No injury. It's all good. I hope this will help someone else.