The high pressure line (bolts into top of p/s pump) sometimes rub along the bottom of the p/s reservoir and end up with a V-shape notch worn into the line. Replacing that line would be prudent. The low-pressure line should be fine, unless it is starting to get some dry rot.
If your high-pressure hose is fine, you'll need a new viton o-ring for the connection to the pump when you reinstall the hose. Auto parts stores sell them (may have to buy an assortment).
Take your time and read the instructions that came with the pulley and life will be good. Oh, and make sure you have new Mopar p/s fluid. I'm not sure what the '98's take, but it will either be red or amber/clear. Some years used red, other years used amber/clear. Do you have a turkey baster or some fluid transfer pump to drain the p/s fluid out of the reservoir?