i have a similar issue with my upcoming jza65, i was planning to use the ra65 power steering pump, custom brackets with a different sized pulley to hopefully keep the max rpm of the pump relatively similar or try to sort a pressure relief valve and run the 1j pump.
The ma61 rack is different but same era and may be similarly pressure rated , maybe the jz swapped ma61 people might be able to chime in.
Know its not much help but food for thought maybe.
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