[oldfielder]

These old girls spring leaks all over the place. If you have a forward fish box, or any kind of drain in the front-that spot is really vulnerable because there is a gap between the hull and liner and that sucker takes a lot of stress. They put some putty around it originally but that stuff gets pretty brittle.
I guess you need to figure out if it's sweet water or salty.
I had a leak that used to drive me nuts. I thought it was a bilge outlet, scupper, ........
It wound up being slight delamination where the side vent was in the stern. Water was creeping around the vent and down into the hull. Some 5200 and a few screws and I was good to go.I found it by getting someone to spray the crap out of the vulnerable spots with a hose while I stayed in the bilge with a flashlight. It definitely helps to start with a dry bilge. Mirrors are good friends too.
One other suspicious place for me has been when I had a few guys fishing in pretty good chop in Montauk and the pumps were kicking on more than I was happy with . It turns out that water was coming in and down into the bilge through my bilge outlet. A riser loop solved that one.
Good luck