Urgent help Cherokee

Put to the 4.0L engine of the American Cherokee Mod 91.

hello.
I have the doubt with what you are requesting, perhaps you could be more specific to the problem you have, because what I remember from that vehicle the tuning of the ignition system is regulated and controlled by the computer, but if what you need is the height of the distribution chain I can tell you that it has alignment marks (some points in each wheel) please
luck...