Albert, Yes if I can find someone, Your right about them drying up. I used to use Cal's radiator on Balboa in Pacific Beach. Long since closed up. There's no market for them anymore. Everything out there is plastic tanks now. Not repairable. Plus C.A.R.B and OSHA didn't help.
Dan, My readings were all 170-175 with the exception of Cyl #3 which was at 160. And thinking the culprit is the valves. #3 is the worst offender (see Pic). But your right, even looking at the picture of the head you can see #1 is dark. Put the head on its side and poured some Kingsford into the ports. All the valves marked in yellow are leaking to some degree from a little to a lot. That's 8 out of 12.
Well, going to strip it down, take it in, and get some numbers.
Tackle the hood removal and cooling components while its being worked on.
Then a big cleanup!
Still looking for a local shop familiar with these. May give Onager a call in the am.
Tyler