With used parts splined first gear will tend to go on smoothly in limited positions.
All you have to do with the cam plate/quadrant is install the detent plunger lightly and fit the other cover.
You can then check 1st and 4th in the cover window top to bottom, a case of go, no go.
Once you start pounding on things, stop, these gear boxes go together very easily.
I did two gearbox's the other week, one had 1.4 mm of end float, the other 0.8 mm, I elected to machine Al/Bronze heavy shims for a reduction to 0.25 mm /0.010")
Be mindful of the fillet radius on the kick shaft lifting that shim (if it is a non modified Isolastic shim)
The shift fork rod got sealer to the thread.
I also remove all the studs and countersink the holes so any raised surface (and there always is) around the stud does not compromise the gasket seal.
