IRS isn't that big of a mystery. I would use a 9" section and couplers/axles from Dutchman and use C5/C6 uprights and build your own control arms. Actually, I would probably build my own uprights too, but much easier to use Corvette parts. Not that big of a deal although kind of expensive.
The only mystery to me is you might get all the handling geometry right (in the computer obviously) but still end up with wheel hop or harmonic issues due to bushing compliance, resonance, etc. The OEM's can test and model that stuff out, but the home hobbyist might run into some gotchas.
ONe of my bigger regrets with the last car I built was that I didn't go IRS, but probably for the best. It was gonna add $4k to the cost of the car and at the time I was trying to be prudent.
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