64-72 older trucks used short pump
but before 69 they used the ram gorn exhaust manifolds ot mount the steel lower bracket to the manifold bolt
69-72 were cast iron and only bolted to the cylinder head
so you would want this
but you could probably rig a 64-68 one
63 older were generator and wont do any good
the upper changed slightly also
the 64-68 were longer and arched more than the 69-72 ones
you would need pullies and all brackets and everything from a 69-72 or same year if older
not as easy of a thing ot convert to as going from short to long style
power steering was a million times different before 73
lower mounted and used the engine mount as well
in which also changed in 73
youll be doing some rigging because you have different engine mounts and such than what the short style p/s was made for
i would stick with long style if at all possible
bigger pump better flow
and no hassle
the balancer you shouldnt have to swap
the front face distance offset was same regardless of thickness of balancer
just different pullies
a 73-79 van style p/s may be a good option because it doesnt use the engine mount like the 72-older ones and it only uses the 64-72 iron cradle bracket and is made for the 73-up style exhaust manifolds it just uses the front manifold bolt only and the two engine block face bolt holes but mounts extrmeely low like the 72 older truck ones
64-68 style:
69-72 alt brackets:
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