The timing can be off. It all depends on all the inputs being within tolerance to the ECU. It then does the math and computes timing and fuel mixture. If everything is right the timing will be within specs.
89 2.5 TBI, 4" RC lift, 1" Booms, SYE, Adams Driveshafts front and rear, Ford 8.8 with 4:88s, BFG 33X12.50X15, and a ton of other stuff.
AF Jeep Club Tail Number 184