Do the 97's have coils up front? Mine was a 95 and had leafs, I was under the impression that all OBSs had leafs.
If it has leafs, you're better off just getting softer leafs and firm shocks. A front coil conversion is nowhere near impossible, but it's quite a bit of work. You'd have to find/have custom made coils that are the right size and spring rate for the ride height and quality you want, make/have custom made upper and lower control arms, and a trackbar to match it all, and make/have custom made brackets for everything. To make the control arms, you'd need to find a good suspension calculator and plug numbers into it and play with angles until you find something that works, and make sure everything is made exactly to spec.
Some people think it's worth it, some don't. For a truck, I wouldn't.