Social security change from personal to spousal benefit

My husband was affected by the WEP and GPO when he retired. He received a very small SS benefit from his work outside the pension plan. He started taking a payment of ~$200/ month when he turned 62. I waited to take my SS benefit when I turned 70. My current benefit is $2689 before deductions. My husband’s benefit just went up to $559 with the passing of the Fairness Act. We are the same age now which is 73. My question is whether he can switch from his benefit to a spousal benefit, and whether it would be higher than his current benefit given that he originally took his benefit before full retirement age. Thank you for any help you can give me.