Just a few weeks back I had my stock 8.2 rear outfitted with an eaton posi unit and gears, and had to replace the axles too. I thought this setup would be fine behind a stout 350 so I didn't bother spending the cash on something stronger. Just found an awesome deal though, 454 out of a 70's pickup for free. As far as I know everything is stock. Do you think my rear can survive behind a big block?