If you suspect them, it's totally worth changing the scups the right way now. Do a search and you sill see all of the changes and repairs people have done to them. Last year, I took mine out, widened the holes in the wood blocks while preserving the glass, filled with thickened epoxy, then redrilled and put new tubes in. Total pain in the ass, but worth it.
Check your other possible points of water entry-all thru hulls especially. I had a small crack in the tube for my forward fish box-problem with that one is that it will let water enter between the hull and liner without you ever knowing it. If you did get it blasted, it's definitely time to check the integrity of any old brass running through your hull.
I am running an i/o-I know very few guys that have completely dry bilges. I'm sure they are out there-I just don't know too many of them.
There are times that my hull seems to hold some water down in the v until I get it on a pretty good slope with the trailer jack-any possibility that this was it? WOuldn't that be nice.
Welcome to the mysteries of old seacraft ownership.
