The top cover at least is a SIIA, suffix F box, so non synchro.
But the top covers can be swapped...
I think only some/all of the suffix H boxes had synchro. Your box is a few years before that though.
EDIT:
The fine(24) spline outer / 10 spline inner with UJ was the setup used on SIII 109" vehicles. So that is a SIII or very late IIA axle - the axle number would help.
The brakes look like 6cyl/v8 linings - are they 3" wide? Do you have pics of the drums?



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