[chiefcfd]

In my opinion a new set of 1” drop springs is equal
I’m height to a set of worn out stock original springs.
Measure before and after you install the new springs.
I either cut the stock springs or buy a 2” or greater drop spring.
Also measure both sides of your truck.
I bet they are different heights.

I agree 50 year old springs probably already have 1 inch drop. I think you would need 2 inch or more to realize any difference.