HELP: 1" front, 3" rear drop...stock or lowering shocks?

[valero]

hey all...just got a set of new 1" front, 3" rear drop springs off craigslist. im plannin on throwin them on my 63 C20, and they came with a set of shocks for the front, but none for the rear...?...my question is: i havent been able to find a rear set of shocks for a 3" drop...so, can i use stock rear shocks with the drop springs, or do i need the front lowering shocks as well as a set of rear lowering shocks to work with the springs?