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What manufacturer are you looking into?
Most likely 28 spline. I do not like lockers and prefer LSD. Auburn Gear makes nice cone style differentials. Strong and smooth, some guys say they don't like them because they aren't rebuildable. My argument to that would be that if you trash one the whole thing is probably trashed anyway and if yours needs rebuilding it was probably weak to begin with. I have an auburn pro behind my big block and it has held up nicely. Hopefully I didn't just jinx myself I would say shop around and see who has good deals going on inclusive of all of the components and installation material.