Earlyclassicenterprises has a sick drop kit for like $800. I've installed them on my 64 and 65 c10s. I went with the 4-6 drop they offer. Rides great and can even haul a decent amount. It comes as complete set. Coils, shocks and drop spindles. Rear end track bar and everything. Check it out before ya butcher some coils and bounce down the road.

I can explain it to you, I can't understand it for you.