Everyone’s needs are different, your mileage may vary, etc., but I have to say that, other in the UK, I have never read about or seen any power steering in use on early Bays.
My (unsolicited) advice to those considering aftermarket power steering units: just inflate your front tyres to 40 PSI.
Save your money for becoming a sustaining member of this club (or for buying shiny gifts for Ozziedog).