A '73 357? It's not a 359?
Never worked on one, but I've seen a few and heard even more stories about them from the local guys that used to run a 1976 359 in The Great American Truck Race with a 1693.
From what I understand they are a good engine with a good bottom end. It is a pre-combustion chamber engine in true caterpillar fashion at the time. As far as the difference between a 425 and a 325 you might be right, but I don't know.
Thats not a leak, its the external lubrication system.
The "Rattle Box"
93 W250 Silver Club Cab, few tweaks here and there.
John Deere Two Cylinders, too many to list.