sure do.... Here is a little write up I did on the differences between the two.
http://67-72chevytrucks.com/vboard/s...d.php?t=240456
Cheapest route is to find a junked K-10 and pull the axle, brakes, steering (arm, drag link, box, pump if you need them all), spring plates and if you're lucky (or patient) then you can find the same gear ratio as the rear. Click on my build thread and you'll see my corp10 from an 82 now sitting under my 68.