Yep, there's one that's very similar to a harmonic balancer installer. This is the one I have:You're saying there is a different style of puller that acts more like a harmonic balancer puller/installer?
Get yourself a bolt that will thread into the pump shaft, about 2 inches long, a nut and a couple flat washers that fit over the pulley. Thread the nut onto the bolt, put the flat washers on then thread into pump shaft. Use the nut to push the pulley on until flush with end of shaft. You may have to cut threads on the bolt or you cold also use a threaded rod. I think the thread size is 3/8 course thread.
I looked at lunch today and all the pulley shaft has is a dimple to center the puller.The 3/8-16 UNC female thread in the end of the pump driveshaft is for the installation tool. The splines that you see inside the end of the shaft were for a pump testing at Saginaw. They have nothing to do with pump or pulley operation.
My mistake for assuming you had a later style pump. I have the same setup on my '69, my pulley went on without to much difficulty. That style or atleast mine had a keyway to keep it in place and was not a press fit. I do remember having to file a little on the inside of my pulley because the keyway slot was not exactly straight. Went on fine after.I looked at lunch today and all the pulley shaft has is a dimple to center the puller.