They make a kit to eliminate the C-clips. I think it's pretty common to do to any of the GM rearends if you have hp at all. How big a deal? Lots of stories both ways, guy raced for years and never broke one, guy was on his way to church in a low mileage stocker and shebango! I do know this, the carnage is usually ugly.
My car needs a rearend too but unless I was doing some kind of numbers matching thing (I'm not), I would not invest all the upgrades into a 10bolt. It sounds like you've already spent good money on yours so it makes since to finish it out.
Jeff-
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You remind me of the timing on a turbo engine...
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