With a rebuilt 401 and a nickel coated cover with hand lapped gears I get 48psi hot and 42 when warm at an idle. If you are getting under 10psi you may want at the least..new gears or a high presure spring. Most likely the bearings are worn but if you catch it you may be able to save your bearings and increase your oil pressure. Dont let oil pressure ruin your engine.