I've got some Issues... well not me, but my car!

AJ/FormS said
Hyup, I'll go with @TrailBeast on the driveshaft thing, instead of bent. It helps explain the hop when it first starts to spin, which I wondered about, but it didn't connect inside my brain.
The EGR remark was just a poke at the sound of the idle. which is a normal function of a performance cam at low rpm.
But I'm sticking with a noisy pinion bearing.
As to the flapping, I wouldn't want to place any bets on that; but I would hold off on the diff inspection until after the U-joint is looked at.
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It does have a cam in it... I really wish I knew what was done to it. When I bought the car 6 years ago the guy said it had a cam and was .30 over. But he didn't have papers and couldn't remember anything else on it. It's due for another rebuild or upgraded to a 360 since its smokes a little and is leaking out of the main seal.