I hate to be the bearer of bad news, but you may have a fairly big job on your hands. When I bought my 1984 J-30 three years ago, it also had a wet bulkhead on the port side due to leaking chainplates. The bulkhead is structural, supporting the rig and also stiffening the hull. I negotiated the repair as part of the deal-they basically rebuilt the entire port side of the bulkhead. New plywood, new balsa core all installed from the head side (no damage to finish veneer in main cabin). Be sure to clean out and West System the hole in the deck for the chainplates-if your bulkhead is wet, you can be fairly sure your deck is wet in the same area. Good luck, I hope yours is not as bad as mine was.
