Relatively minor
Ship names seldom make a big difference in their actions, although they do make a difference in their fate after their duty is over, sometimes. If Massachusetts had been named USS Vermont, she's unlikely to have survived, since Vermont has no way to bring her home.
USS Missouri may be an exception, since IIRC, Truman directly arranged for the surrender of Japan to be held onher decks.
To get a major ship named after Marblehead in this day and age, with a 1981 or later POD, there probably has to be a politician from Marblehead who needs some major strking to get a vote from. It seems that ship names are political these days--which infuriates me. USS Ronald Reagan, USS George Bush, USS Jimmy Carter--all named after current politicians who weren't even dead when the ships were named. And--the presidents involved weren't even widely condidered to be great presidents.
Alternatively, have an earlier POD that has an earlier USS Marblehead taking her place alongside of ships like USS Johnston, Intrepid, Gambier Bay, Yorktown, etc...