5-10 is not enough as you already know, my stock oil pump on my rebuilt 351w in my old bronco cranks out 25-30 at idle when hot, a common oops when rebuilding a motor is forgetting to reinstall the oil galley plugs or forgetting to tighten them. with a missing galley plug you will have next to no oil pressure. if you forgot the rear galley plugs you would have a MAJOR oil leak at the bellhousing, to check the front galley plugs the timing cover must come off, also if a main or rod bearing has too much clearance itll bleed off oil pressure,i hate to say it but the motor has to come apart again to see whats goin on or itll come apart all by itself if you know what i mean.if it was me id remove the intake/ valve covers and timing cover and using a oil pump primer spin the oil pump and watch for any hemmoraging(spelling) of oil anywhere, the valvetrain should get even amounts of oil flow on both banks, if everything looks good up top then you have to pull the motor and check out the bottom end, just so you know oil pumps themselves rarely fail. its almost always something else that causes an oil pressure problem. good luck.
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