TedRamAirII,
From what the tech said, he noticed slight "uneven wear" on the new distributor gear. The new distributor bushing and gear have less than 2 hours of idle time. When Paul recently discovered the bad distributor bushing, he said he tore the engine apart. I'm imagine that he checked the cam gear.
Sirrotica,
As grivera says..It's a 455 block with a factory 455 crank.
Here are the pictures of the oil pump shaft again along with the videos of Paul explaining the damaged distributor bushing.
https://www.youtube.com/watch?v=dmwzlUPfaw4
https://www.youtube.com/watch?v=zRO0vuHfuYg