there is, but like everything in life there's caveats...
if you want to keep your wheels and bolt pattern, then SSBC and wilwood make front kits. these are practically bolt on. the wilwood *may* require 15" wheels and *might* not fit all 14" wheels.
dr. diff, inline tube and a whole host of other companies make a kit that is a little more involved in that you need to swap out the spindle and possibly the control arms (or at least run an adapter). this is the "73~76 big bolt pattern" factory style stuff that's got a modified rotor for small bolt. again, you may have issues with wheel fitment.
out back, you'll need an 8.75 rear axle to take advantage of a disc kit, i'm unaware of anybody making one for the 7.25 axle.
if you're okay upgrading your equipment across the board and getting new rims (and tires) then the sky is the limit, but be prepared to open your wallet W-I-D-E