2 x 4's hold up your house....
If a 2 x 4 can hold up a house, they can support the load of a mast. I don't know what boat you are referring to, but the mid 80's Hunters had 2 2x4's that supported the mast.When we had ours redone, we had the 2x4's replaced with a stainless steel (round) post and it was boxed in with the original teak box.