Took the 72 beater for a little run. Mostly stock 440. Was already rebuilt when I found it in a truck. Seem to have either a high pressure or high volume pump.
Got on it. WOT. Caught a nice scratch in 2nd. Hit 3rd and then let up. Valve train started rattle and look at the gauge, no oil pressure. Shut her down and ended up getting the trailer and towing it home. Drive gear and shaft are fine. Tried priming the pump, nothing. Changed out the pump, oil and filter. Primed right up. All seems to be good. No metal in oil. Never got over 180*.
So what makes a pump fail? Took it apart and looks fine. Thinking that the by-pass valve let go?