Mysteries solved!
Today I was determined to find some answers. I had to crawl on my stomach to get to the head thru-hulls and did a little measuring to find where the strainer thru-hull should be inside. I think I mentioned in another thread that they set my cradle on 4 courses of cinderblocks so the bottom of the hull is 8 ft in the air and the gunwales are 16 ft to the ground so played acrobat while I was at it. The cradle blocks me from putting a step ladder close to anything on the hull and still reach it.
I climbed up on the cradle and hung from the pad adjustment handles to reach one of the pencil-sized penetrations. They are actually 3/4" thru-hulls that were filled in with bottom paint and gunk. I scraped around to see what was was up and got them all cleaned out. While I was there, I checked the balls. They're still in pretty good shape except for little spots of corrosion or dirt. Couldn't tell very well because I also found out the hull, at least below the water line, is 1-1/2 inches thick minimum. No wonder the boat is so heavy for 32 ft. They weren't kidding that boats of this vintage were heavily built. Oh, and there are no mushroom nor inset heads. You can see the layup around the hole. I'm guessing they screwed a flange into the hull, connected a valve and called it a day, That may explain the pile of resin/fiberglass around each valve.
I found the two head seacocks under the V-berth underneath the black water tank. Similar construction as the pictured one earlier except the mound of whatever is not as big as under the sinks. The valves still turn freely. The supply is still connected but the discharge hose is gone and the valve talipiece is plugged. You can't see it in the picture.
Then I went searching for the mysterious strainer thru-hull. I managed to wrestle the boom out of the way and moved the sailbags to get to the settee. Under the cushion I found a small removeable panel. It was then it dawned on me that there once was an A/C unit in the hanging locker just forward of the settee. There are just wires hanging there now. I looked inside and under a bunch of filters and cut up hoses I found the missing seacock. The install doesn't match all the others and there is a plywood backing plate so I suppose all the others were the OEM installation and this was the add-on. This valve turns freely also and the valve is plugged. You can see the pump just below it in the picture.
Since I'm not going to install another A/C unit, I'm now wondering how I'm going to lay up 1-1/2 inches of cloth and epoxy. I think this is going to be the biggest job. I'd appreciate some suggestions such as which cloth(s) I should use and any particular order if using different cloths?
Thanks to everyone who had ideas, suggestions, etc. I'll add to this with pictures as it goes along in case anyone else ever runs into this. Now I've got to get spending those boat bucks.