I took some 13/16" stainless bar stock and threaded 1 end with 3/8-16 external threads and drilled out the other end to a depth of 2.5 inches at the diameter of the spindle of the oar and I bolt these in place in the existing holes on the boat and that raises my oars up about 3 inches.
Post pictures of the whole boat inside and out showing how the seats are and how they are attached. Include measurements like width at widest point, width at transom, length from transom to point.
I strongly advise against the use of poured foam in the bottom of the boat, UNLESS you can prevent the foam from going to the center bottom of the V. My Crestliner has poured in foam in the 2 side compartments and nothing down the center. The hull is still clean. EVERY boat that I've ever dealt...
The boat looks like it also spent a lot of time in the water, probably next to a dock. I'm also betting there was always enough water in the boat that the transom wood was always wet. If aluminum is always wet and there is just enough air flow, the aluminum will oxidize. I fixed a boat for a...