The shop building where my truck is kept was unusable to me this afternoon as the power pole had keeled over, and it's hard to get much wiring done in total darkness. Maybe with Master Yoda training me, but I'm not there yet..
So, I brought the relay panel home and i.d. tagged the wires. I end up with two relay locations wired that won't be used, one was for the ignition relay (on a 60 series of course) and the other was for the heater relay. in addition to that, the cluster has room to instal another two relays. These would have been for the headlamp washer motor relay, and a charge lamp relay. i will wire up the charge lamp relay, as I included one in my wiring diagram design, but that still leaves me with some unused capacity.
It is nice to have the 60 series relay cluster, as now I will have factory headlamp and tail lamp relays, along of course with the intermittent wiper. In the second picture you can clearly see the relays. The green one is the flasher, the large square black one is the wiper relay, and the two cylindrical ones are the head lamp and tail lamp relays.
I decided to go with the 4-core radiator rebuild, with the good copper. The radiator guy said that aluminum rad cores are not field fixable for one thing, and not as durable as the copper ones. Since he does a lot of work on rads for commercial logging trucks, and has 35 years experience, I'll go with that.

It should be ready any day now.
I realize that a lot of the parts in this re-build are going to be good for a very long time. It's a lot of up front cost, but it's nice to know that from then on out, my cost should be confined mostly to maintenance, and I won't be worrying about what part is going to give out next (which is unfortunately the normal automotive experience of my life).