Being that it's a '97 the stock springs have sagged, and probably to the point that spacers might bring you back to original height. What I would suggest is getting some new springs that are already 2" taller than stock. This will give you the lift that you want. Then with the addition of bumpers and a winch, you can add spacers as needed to level it back out. As far as the shocks go, yes, new ones would be needed. Some budget kits come with extenders to make the stock shocks work, but really are not the best method. Proper length shocks are best.