Well if you have a running flat tappet engine in the truck it's easier to convert it to a roller cam since you wouldn't have to pull the engine. But the other side of the coin is the ~$1,000 or so it will cost for the small base circle cam, lifters with the linking bars, new pushrods, etc.

If you're rebuilding the engine anyway get the roller block. IIRC, the blocks were roller ready after 1990 but they didn't start installing factory roller cams until 4-5 years later. The spider, dog bones, and lifters are easy enough to find on eBay if it's a factory roller block with a flat tappet cam.