A little update. I cut off the very end of the driver's side tube at the heater control valve and the tube itself was in very good condition. I cleaned off the tube ends, sanded them to bare metal and painted them with POR15.
Installed silicone 5/8 to 3/4 hose from Pegasus.
The left side worked perfectly. The right side (5/8 to 3/4 90degree) was too loose on the heater valve. It seems it's less than 5/8. So I've ordered a 1/2 to 5/8 reducer and will try that.
I removed one of the hoses on the engine side and checked the tube and it too looked good. Reinstalling that hose (it's new from the restoration) was one of the most difficult and painful things I've done in a while.
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