And for whatever it may be worth, i have replaced very few ford pumps over the years, but lots of saginaw pumps.
The only reason I had to mess with the possibly original Saginaw pump on the 85 RV was because the huge O-ring seal to the reservoir was leaking. The pump itself was fine. I replaced it anyway due to it's age and difficulty to replace on a van chassis. I kept the old one though as a spare.