Which lift kit to use???
 

I have an 84' Chevy C10 4x4 where the front springs are starting to de-arch. I want to give the truck a 2 inch suspension lift along with a 2 inch body lift. I don't want too harsh of a ride from the lift. what has everyone used, and what does everyone recommend?

Not sure how much you want to lift the truck. Also unless it has a conversion you would have a K10 if the truck is 4WD. Our most popular kits are from Zone Offroad. They have a 4 & 6 inch lift kit for your truck. Comes with full leaf packs for the front.

I want to lift a total of 4 inches (2 suspension and 2 body)

Then the 4 inch kit should work good for you. I am not a fan of body lifts. Is there a reason you want to go that route? At least you only want 2", that would be the limit for me. Having to move all the extra stuff and filling gaps isn't fun.
Not sure how much tire you want under there?
If the front springs are truly sagging (which wouldn't be surprising for 32 year old springs) then new 4" springs should net more than 4 inches. Also, I don't have a source that I know of for a new 2" leaf pack.