What was wrong with the rebuild? I would want to know what was wrong with it in the first place that it needed a rebuild. If the current cam is worn visible to the eye and the fingernail test, then make sure new cam, new HLAs (hydraulic lash adjusters) (think "lifters") and new followers. Better yet, if you are satisfied with stock or close performance, convert to a Ranger roller cam and associated parts. Rollers generally don't wear out and were used in 91-93 Mustangs or 89-93 Rangers.
Pete Dunham