A vacuum leak would/could cause the plugs to look the way they do AND cause what sounds like the miss.
It is obviously richer'n hell, but some plugs show pretty lean.
This can happen when air is getting in somewhere it shouldn't. (vac leak)
You sure you plugged everything back in (even on the back of the carb?)
Vacuum leaks can be anywhere, not just the vac can hose.
Did anything go on in the trans recently?
Filter change or anything?
Also, are you holding those plugs in the order they go in the motor?
