Mopar 8 3/4 disc brakes with stock tapered roller bearings?

I would like to put an 8 3/4 with disc brakes in my 1968 Barracuda. I haven't done much research yet, but when the subject would come up on here I would see that you would need to remove the stock tapered roller bearings and install the "green" bearings. Has anyone come across a disc brake kit that you can keep the stock type bearings?

Almost forgot, I'll be using 11.75" rotors in the front. So the rear disc should be equal or smaller in diameter.