Tire pressure for a 1962 Valiant with 14" tires

Since everyone is guessing,
My guess is that ;
1) the Ideal pressure will fall in the range of 26>30psi, and
2) For touring; the right pressure to run, is the one at which your tires last the longest, running the tread off more or less equally from side to side. From that Ideal setting you can add or subtract pressure to deal with other circumstances.
For example; In British Columbia, Canada; if zipping thru the mountains, I would pump it up, some 15/20 % for stability in the corners.
The Max tire pressure printed on the tire is at a specified load. IMO, it has nothing to do with what you need to run, unless you are already at the max loading.
For comparison;
On my 3650 pound (me in it) 360 equipped, 68 Barracuda are;
>On the front are 235/60-14s, on 7.5" wheels, running at 28(ambient). For long distance touring, up to 10% more, unless I'm on a fuel-economy mission.
>On the back are 295/50-15s, on 10"wheels, running at 24 psi, Those 10" wheels are a tad narrow, so 24 is what it takes to run them bald from side to side.