Been there, done that
Ernie:I bought a 1989 322 this spring, and the surveyor found serious delamination in the rudder, along with more-than-desirable separation in the keel/hull joint.I could've drilled, drained and refilled the rudder, but the surveyor said this would probably only buy me a little time. (There seemed to be about an inch or so of deflection between the skin and the core.) So, after renegotiating the purchase price, I opted to fit a new rudder, made by Foss Foam in Florida (see link below), which has ready-to-go templates for the rudders on the vast majority of production boats made in the US in the last 20-25 years. As I recall, cost was $1,500 plus shipping and installation. Not cheap, but I'm good for the long haul.As for the keel/hull joint, it wasn't anything so drastic as to require dropping the keel, but what I did do was, first, retorque the keel bolts (280 foot-lbs for the 3 big bolts, 160, for the smaller one). Then I cleaned out the joint (with a scraper and a Dremel), and resealed it with 5200. Once that cured, I scraped and sanded off the bottom paint for a couple inches on either side of the joint, and laid on a heapin' helping of Interlux epoxy filler, fairing it as best I could and, once fully cured, giving it a followup sanding. Then came two coats of West system epoxy, and, ultimately, the bottom paint.So far, a nice dry bilge. Now wasn't that simple?Good luck.Pete