Jim,
Perhaps you should just decide where you want the shore power cable to plug in, and wire in new to the AC panel. Mine is portside in the cockpit, but you might prefer someplace at the aft of the cockpit so you don't have the shore cable underfoot. My '75 32' is all wired in romex from the factory, but I would use three-conductor 12 awg marine cable for any new stuff. You can often get it cheap from skycraft surplus in orlando. Let me know if you can't find anything you can use. I would dip the wire ends in solder before terminating, because most of the AC stuff is designed to work with solid wire.
I have some diagrams of generic ac wiring and also of the way I am doing my boat on my website at
www.geocities.com/dougmrose
1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida