Did you ensure the engine was at TDC before removing the old distributor? Timing is set by the Crank Position (CKP) Sensor, fuel sync by the Cam Position (CMP) Sensor or ignition pickup as many parts stores call it.
Whether you did or not, crank the engine round to TDC with a wrench then remove the distributor cap. If you look at the rotor arm from the side of the Jeep and compare it to a clock face what hour is the rotor arm pointing too? If the engine is at TDC on the firing stroke for the #1 cylinder it should be at roughly five o'clock.