After recently seeing a video on a cammed 4.0 I've decided to cam my cherokee. The problem I'm having is when I looked under the applications section of the cam kit it only listed up to 1997 for the 4.0. What differences were made to the 4.0 after 97 that makes this kit not compatible with my year? Do they make this kit for 99 cherokees?

Link to video:

Link to cam kit:
http://www.summitracing.com/parts/cc...ep?prefilter=1