Don't think there is much you can do to a 450 pump except replace seals.
The aftermarket pump is probably a M&W or Hydreco. Don't know what they are rated for. Hydreco probably made the M&W unit. I have several of those pumps but have never installed them and don't know how they perform.
I doubt if you will find a stronger gear than the IH cam gear. I am not saying it is strong. Just doubting whether an aftermarket supplier offered an alternate. That gear was beefed up with the advent of the IH live hydraulic system as found on the SM.
If you have a need for more pressure than 1200 psi, you should go with slightly larger hydraulic cylinders for more lift or do something like what is pictured below. Northern Tool has them for around $520 or they can be found in truck salvage yards.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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