BIG blocks and 8 3/4 dont go, lol

No. HD truck danas have full floating axle bearings and axles. So they need to have the axle ends cut off and std pass car flanges welded on, then new axles, and you still have no provision for pinion snubber for those that like them. The best way to get a pas car dana now if you are racing is brand new, made to order. Instead of buying a core, then repalcing everything (or most things).