What drop do I have?

[epfatboy]

So I picked up a 1974 C10 short bed style side. Got a nice stance to it but I'm not sure what the drop is so I have a few questions!

I can see the rear has a rear shackle extension with new ubolts and shocks, springs look stock.

The front has new shocks and springs but didn't notice much more that was new... the spindle might have been newer looking.

NOTE: I just dragged it 15 hours one way home so I really haven't got in to it yet and I'm a little banged up from driving straight thru so I could have missed ALOT!

How do I measure the spindle to tell what drop it has if any? Also could the front drop be a combo of spindle and spring?

Same for the rear, I can easily measure the extension but don't know how to convert that to drop.

Here is the truck what I picked it up

https://photos.app.goo.gl/UDF5uUiEGNpm2ljy1