Best tire pressure for 69 dart with P245 60R14

The make on the wheels I posted before is Italmagnesio, made in Argentina in the 70's... and someone got that set in great shape and made it look like new. I have another set for the dart from the same manufacturer made in the 70's and I can tell they are very light in weight (at that time they called them magnesium so it must be an alloy).
Very interesting. It is common to call them 'Mags' even when they are made of other materials. Of course there is a slight chance they are magnesium. I think you will be able to find out.

the darts assembled in Brazil in the 70's used an old bolt pattern from willys so the bolts are closer together just a bit than the pattern on the US darts... not sure why they did that but most certainly to differentiate from the ford maverick, which was made and sold here at the time (302 V8), still the left side has counterclockwise threads.
I found an ad through google that says the bolt pattern is 5 on 4.25". If so, that's inbetween the diameters used on North American Chryslers. Ours are 5 on 4" with 7/16" diameter studs, or 5 on 4.5". People abreviate SBP (small bolt pattern) or LBP (large bolt pattern).

The rim wheels I posted have stamped in the back DART and were made right for that car so there are no issues as far as clearance, backspace, etc... unless the tire is too large.
That's good. You can do some measuring on your car with the rims before buying the tires. Put a jackstand under the front and measure hom much distance clearance it will have to the closest points of concern.

Below is a pic of my car, been sleeping for almost 20 years and now will probably run once a week, after I finish spending the hours and $$$ necessary.
Thanks again, nice talking to you.
You're welcome and thanks for sharing. The front looks more like a Charger or Austrialian Valiant. Neat.
The front ride height looks a little high. Bring it down a little and the tire will fill out the space more.