My:

440 in '69 Charger - 70psi @ cold idle, 50psi warm idle and cruising... GTX 20W-50
318 in '89 Diplomat - 55psi @ cold idle, 50psi crusing warmed up, 25 psi warm idle... Napa 10W-30
318 in '68 Satellite - 70psi @ cold idle, 60 psi crusing and warm idle... Napa 10W-30