If your ride height is altered at all, get the adjustable uppers. I battled this with my wife's old Chevelle. It had been lowered fairly significantly in the back and the previous builder sectioned and welded the factory upper control arms where they thought the pinion angle would be correct. It wasn't.
You're putting a big boy rear end in this thing to use that big boy power you've got from what appears to be a pretty stout engine up front. You're going to want to use this stuff. If you don't buy the adjustable piece now, you'll probably find that you need them later, or at least want them so you can make the car perform better. Spend the 100 or so extra now, or pay double by buying two sets over time. That's kind of the situation that is being set up here.
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-Jason
1969 Pontiac Firebird
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