The Big Boy! Mine was a 429. I replaced the oil pump in it. What a job! 22 bolts around the oil pan, with rubber gaskets on each end. Took the pump apart and took out several hunks of dried out rubber seals, stuck the shaft into the bottom of the distributor, and put it back together. Put the rotor on the top, and when we were lining up to the number one plug, the shaft drops out and down into the pan! You could see it through the drain plug, but couldn’t get it out. Had to take it apart again! Long job!