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check the "u" joints and check that the drive shaft flanges have been properly fitted to the pinion flange or that the "u"joints have been properly fitted into the pinion "ears " of the pinion.. Check that the correct grade of oil was used in the diff and it has the correct amount. New out of the factory diff should not be noisy but if you have a new rebuilt diff then it is possible that the gear mesh is not correct or used gears were used where the best mesh was obtained.
what does the noise sound like? it may be cam noise form your cam lobes or you may have a lazy cam follower what did yo7ur motor rebuild consist of and are you sure noise is from top end and not an over tightened cambelt wich will give a noise similiar to noisy cams
There is a very good chance that it is a noisy lifter. They can look and work fine but make noise. Alot of GM cars and trucks end up doing this and there is not anything mechanicaly wrong with them. I would NOT replace the motor because of this. I have never heard of a ticking sound being caused by something in the bottom end of the motor. If it was something in that area you would probably have wrecked the motor by now, or your oil pan would be full of metal shavings.