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I believe power steering was not stamped on fender tags even though there is a code for it. I could be wrong but my 69 has PS and looks to be original and it ain’t on the tag.
Have you looked if there is a gear ratio tag on one the housing bolts?
If not, use this formula:
RPM= (MPH x gear ratio x 336)/ rear tire diameter
Just go for a drive at 60mph for example. Note your rpm at that speed. Experiment with different gear ratios until the equation matches your rpm.