Chevrolet: losing oil pressure, dirt track car, motor mechanic

Question
running a 362 chevy, new cam, heads redone. new oil pump. motor has been pulled out and checked by a racing motor mechanic.  will not hold oil pressure. had the bearings checked. dont know what else to try. this is a motor for a dirt track car. any help. thanks

Answer
Dona;
Hea- well have you checked into hi-volume oil pumps  - also oil pans for  for dirt tracks as you might need a sump pump or a baffell.or you can try a elect. oil pump booster so you will have oil squriting on to the rockers, you will need new  valve covers with threads for the oil tubus. but it will be 100% better. and some tubeing.