I know this is not much of an answer, nor is it much help. But, I don't know much about all of what you stated with all the offsets and all. I just ordered my 9" from Currie that was built to my Chevelle's dimensions and specs. They did all the math work. Unless you are building your own (which I was unable to do), just order one already built form Currie, Strange or any other rear end shop.
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'68 C10 swb
'69 Camaro convertible
'72 Chevelle
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