97 ought to be 350 with a 4L60E four speed, NVG 241 transfer case (or more likely a push button 'case but I forget it's name). Half ton axles, IFS up front. IIRC, they might have still had the 6.5 diesel with a 4L80E as an option) IDK if it's still called a K5 but, at the very least, it is in spirit! My buddy had a 95 and the only thing I remember going wrong with it was the vacuum actuator for the front axle (a kind of a central axle disconnect). It wouldn't go into 4x4 but, that's easy to fix, only took me like 15 minutes to replace it. They are nice rigs, very comfy, great on road and good offroad (obviously the IFS isn't as good offroad as a straight axle K5offroad but, still good). His rig had a 4" lift and 33's, sharp lookin rigs! The only issue I can think of elsewise is that the Vortec 350's seem to like to go through intake manifold gaskets. But overall, nice solid trucks!