On a 1997 GEMs truck, you cannot fit an off the shelf Crower cam. The reason you have to buy the kit of D&D is because his kit makes everything fit. In other words, you can't buy his cam only and use a stock timing set. It will not work.
If you're unwilling to pay for the kit, then you're stuck with either a stock 4.0 or 4.6 cam.
Likewise, if you're too cheap to buy the cam kit, you'll never be able to afford the supercharger and all the bits to go along with it. The cam kit is like $450.00. A supercharger and all the bits is several thousand dollars.