is it all worth it?

Ya gotta take into account that the 73 and up already have disc brakes also.
Don't particularly like the 73 front end but it was worth it in the end to have the disc's and large bolt pattern.
The hood, grill and bumper can be changed.

Only 73s up with BBP has disc brakes from Ma Mopar. All 73s up with factory SPB are drum brakes.