Tire pressure question

IMO;
28 all round should get you fairly even tire wear.
in my 68 Barracuda, on the Street, formerly a DD:
I run 29 in 235/60-14s on the front, @1800 pounds on them; and in the rear @1600pounds;
28 with 275/60-15s on 8.5s or
24 with 295/50-15s on 10s
I prefer to start off at a lil less than optimum cuz the tire-wear is easier to correct, than if the centers get rubbed off.