Once you start using sticky tires is usually when you start spitting out the stock limited slip 8.5 diffs, I’m sure they will handle 400 horsepower no problem if the tires can spin.
Your guess is as good as mine when you’re talking about 8.2 cone-type posi units. I had a decent 3.36 posi 8.2 and I sold it so the next guy could deal with whatever might happen to it in future. The later clutch-type posi units are much better.
I plan on upgrading my Le Mans convertible with a Buick/Olds 8.5 factory limited slip and 2.73 gears to replace the one-legger 2.56 8.2 rear. My 421 HO is a mild build making maybe 350 horsepower.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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