Did you happen to check the bottom of the lifter for wear? If you can put a straight edge like a machinist's scale across the bottom of the lifter where it contacts the cam, it should be slightly convex or at least flat. If you can see daylight in the middle, it's worn out, and the can lobe will be toast as well. If all you're interested in is getting the engine running, no sweat for now, but if you intend to do more than drive the truck on and off a trailer at a car show, you'll need to do some major surgery soon.
Jerry
