I'm doing it right now. 4dr Kick fronts on the Sammy. They fit, but come real close to the king pin bolts. Also, I had to remove good deal of material from my hi-steer arms to make it work, and do a slight bit of grinding to the caliper.
Others are running Kick brake upgrades without problems. If you run Sammy calipers in the rear, this helps get proportioning bacj=k