All of the 'LA' engines physically fit the same distributor. 273, 318, 340, 360 cubic inch - doesn't matter.
It looks like this also true for the later 'magnum' versions of the 318 and 360.
If you had the original distributor from the Jeep Grand Cherokee you could see how it fit. But as far as I can tell its not readily adaptable to a simple carbureted setup.
The wiring on the vehicle is the other factor that will be helpful in choosing the ignition that will plug in most easily.
What year and model car (or truck) and does it still have its factory wiring?