Funny enough, I was JUST talking to a former student about this very subject. IMO, the S10 a-arm suspension is a great starting point for a custom IRS. The drive components might be a little light-duty for a heavy (3000+) car with serious horsepower, but other than that I don't see any downside to using it. I would definitely correct the camber curve geometry to match the tire being used.
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Ray Kaufman-Wyotech chassis fab instructor
Custom suspension design and consultation.
(Now 2) Big Block asphalt supermodified ('cause too much is never enough...)
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