The only way it can physically jump time is on the belt. The spark timing is electronically controlled via the PCM. But, if it physically jumps time the PCM won't know this and you would get strange timing readings. You really need to verify that the physical timing is set. You have to lock the cams in and then make sure the crank mark is lined up.
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1998 Escort ZX2, T3 Super 60 at 8 psi, SCT Xcal2, Cobra MAF, 42#/hr injectors, MSD coil, Ford Racing wires, Ford Racing UDP, Fidanza flywheel, Spec 3 clutch, B&M shifter, Trubendz 2.5" exhaust, 19mm RSB, ES bushing kit, Eibach sportline springs, other goodies....
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