Not wanting to flame anyone but I see you posting on this forum. If you read the description on the main forum page,This section is for J series, Full Size, and Commandos. I think you may be able to find more questions to your answers on the Cherokee Forum which is for XJs and your MJs.
73 Jeep J4000 360 .040 over, Summit K8600 Cam, Edelbrock Manifold and 750CFM 4V TH400/1339 QT
78 Cherokee Chief- Hunting Property Rig
05 Grand Cherokee- 3.7 V6 5 speed auto