Re: clutch problem
When you say you can’t get it into gear with the engine running I assume you mean the gears grind when you try to engage? I believe ‘63 was the same as my ‘60. Is it a sm420 with a hydraulic clutch?
Sounds to me like the flywheel is not disengaging which is throwing the synchro off. Try cycling through all the gears with the engine off. Ending in 4th. Than start it up and see if you can put it back into 4th. Also try pumping up the clutch a few times before shifting. May or may not work but could give you a better idea of what is going on.
There is an adjustment nut where the slave cylinder meets the fork. Try setting it out further. Or master/slave cylinders could be on there last leg. Get eyes on the slave cylinder when someone pumps the clutch and see how much travel you get.
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