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 - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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