Dana 60 strength?

4mopwr, I hope it´s ok to bust in to your thread with a question...
Since you guys have the experience... what do you say? I still haven´t change the axles in my SS/B Nostalgia Barracuda Build. Car is very close to how they ran in ´68-69. Race hemi (600+ hp) 4-speed and B-Body Dana with 4.88 gears. Slicks will be 10.5" in my case.
Question: should I change axels, or will they handle this relatively milde version of an´68 SS A-Body? Car will se only Nostalgia and exhibition racing...
Thanks,
Stefan