Best tire pressure for 69 dart with P245 60R14

Front is a bit high because the streets around here are real cr**, I want to lift a bit the rear, need to re-arch the leaf springs a bit.
This model was made from 1976 through 1978 only, mine is a 76, it was a more luxurious sedan they put out for sale at that time. All darts here had the 318LA V8, the automatics like mine had a A-904 instead of the 727, with a DANA rear axle (yet open).