>>63896527
As you can see from your map, you can attack Khuzestan Province from Southern Iraq, which is where the majority of their petroleum industry is located at. Take the oil fields and you economically cripple Iran, combine with bombing military targets and blockading the ports, you'll have enough leverage to settle for an advantageous peace treaty. It'll humiliate and discredit the Khomeini regime and make it easier to cause a revolution. There's no need to fully occupy Iran and start another forever war.