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I have this bronco with a 1978 351w in it.When the oil is cold it has good pressure.As soon as the oil warms up the pressure drops quite a bit.theres also a knock on the passenger side of the engine that is really only there at cruising speeds.It goes away while accelerating and deccelerating.Should I replace the oil pump or is there a different problem?I have no idea how many miles are on the engine as it has been swapped in at some point.thanks