To put the latter crank in the 59A if your going to use the 59A water pumps and the 59A front timing cover for the distributer. You simply use the 59A crank pulley. The snout on each crankshaft is identical the only difference is the latter crankshaft typically has a ring pressed on for the rope seal that needs to be removed. If your going to use the 59A crank pulley the seal ring is already part of the pulley assembly.
The other issue usually will be the latter crankshaft timing gear teeth angle would be at a different pitch angle. If you find the this to be the case the 59A type crankshaft timing gear can be put onto the latter crankshaft as well.
Ronnieroadster