What the heck is up with 8-3/4" rearends?

That's a great deal in my opinion Tim.
Original a-body 8 3/4 prices definitely have increased but still plenty of options available for a strong durable rear depending on your budget.
Prefer to stay mopar myself and was fortunate to find an original a body 8 3/4 awhile back at a nice price.
Now just gotta get it out of spare bedroom ( parts warehouse, LOL ) and under my 65 Valiant.

Oldschoolcuda