I dont think the b 52 is moab ready yet
https://www.popularmechanics.com/military/aviation/a21934064/b-52-bombers-pylon-improvement-moab/
A new wing mount would mean the B-52 could carry the Mother of All Bombs, or a lot of smaller ones.
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By Kyle Mizokami
Jun 25, 2018
The B-52 has the bomb lift capacity to carry two GBU-57 Massive Ordnance Penetrator (MOP) bombs (30,000 lbs each), but I believe it cannot be configured to carry more than one.
The B-2 can carry two. It's the likely airframe to deliver the MOP.
The MOP is what you want to shake up Iran's uranium centrifuges.