I’m currently working with a ‘97 - 5.9
You can call Howard’s or any cam company and ask for there help. When ordering a cam, the entire kit is often a smart way to go since the valve springs are matched to the cam and then the retainers and locks can also be purchased as well for the valves in the engine. So in one shot, you’ll get the cam, lifters, valves springs, retainers and locks. Measure for the pushrods. If you don’t have a pushrod measuring rod, that can be ordered from most cam companies. I got mine from Comp Cams. Then you’ll need a caliper able to measure them. I picked up a 12 inch caliper from Power house.