I live up in the mountains in n San Diego County. I reside at about 3,500 feet. The highest elevation I would drive would be at 5,000 but going toward town (SD) it just goes down hill all the way down to the beach. The 60 ft above sea level you are referencing is anywhere along the beach to a mile inland.
I have been looking at 46RH transmissions since starting this thread and it’s something for the back burner. If one pops up for cheap I’ll snag it but I will need to stick with my 727 for now.