Drop Spindle I.D. and drop springs

[Critter]

I have been working on 67-72 trucks for over 20 years but admittedly I have never owned a lowered one. Everything has either been stock height or a raised 4x4. So now I need help with a truck that is lowered "too much", please bear with me through the stupid questions. The truck in question has cut stock coil springs AND drop spindles. It is a little too low in the front for the owners taste. The goal is to raise the front of the truck back up between 1 and 2 inches by installing some new coils but because I don't know exactly what has been cut from the stock springs I have to work backwards with the math. So here is what do I know...

-The CENTER of the front wheel hub to the fender lip is 14.375" (or 14-3/8" whichever you prefer)

-Aftermarket lowering spindles but I don't know how much drop. Are they all 2.5" or is it possible to be a different drop??? I attached a pic where I think I see a logo or part number in the casting but I can't make heads or tails of it, maybe somebody will recognize it.

Basically I need help confirming that I am working with 2.5" drop spindles and I would love someone with the same spindles and drop springs to tell me what combination got them to approx 15-16" of measurement between the center of the wheel hub to the bottom of the fender. Maybe I need a new 2" drop spring to achieve this? Maybe I only need a 1" drop spring??? Sorry for the confusion and rambling, thanks for any help possible.