My input on stringers..... I bought a '78 three years ago (the old style with the twin saddle tanks). The transom was a little "springy" that is, when I put some weight on the prop I could see flex in the transom. So, I went to a resin/filler supplier (near Atlanta) got their version of seacast filler (chopped glass fibers, mineral dust and a foaming agent. The finished product has a density of oak. I cut the top edge off dug and vacum'd out all the old wood (some was like a dry pulp) and then noticed the stringer "slots" at the bottom were also full of "dust". I called Wellcraft and was told by a guy that the wood was pretty much just a form for the glass. The glass is still there. I drilled a 1/4" hole through the back, filled the stringer slots with exp p.u. foam, trimmed, then spaced, clamped the transom and filled it with my resin mix. I have had daylight between me and the waves! It's solid as a rock. The bow will lift off the trailer with enough weight on the back of the motor. (Why "re-glass" the stringers if the glass is still there?) (Note, I think in the later years, they used less glass/resin and the stringers may be more important). The only thing I wish I'd have done is to remove more of the sludge/pulp from the two middle stringers because if I get a lot of water in the bottom the water finds a way to get in the port side stringer and get a little heavier before it drys out. If anybody would like a few pics I documented the process.
Best of luck,
Trollercoaster ;D