Classic Trucks Past Issues

when i bought my 64 the guy i bought it from wanted to lower it and never got around to it so he threw in springs for the back i wanted to know what drop coils these are? the springs have three major coils in adition to the top and bottom minor coil for the cups to lie in so a total of five. how many inches will this drop the truck if any because it was originally a 3/4 convert to 1/2 so for all i know he just tossed me some stock 1/2 ton rear end coils!!! plus i cut one revolution in the front springs sat fine but noticed that from the stock desighn it curls down from top of coil haven't drove on em yet because the trucks still on jack stands due to still going thru all the steering and suspention...