McGaughy spindles,springs,shocks

[jimboh247]

Pick up a screaming deal on a set of McGaughy spindles, springs and shocks off CL for my 85 C10. $100 for all.
Only problem is, any number I search for off the parts comes up nothing.
The guy I bought them from as an absolutely sweet 86 shortbed. He didn't like how low the set dropped it.
All I want to know is, how much of a drop am I going to get?
Shocks are #1850, which is the only number that makes sense.
Spindles have 6072R on them.
Springs have 7387-2 on them.

Any help will be appreciated.