You did the hard part by getting the seal removed, without taking the cover off. The seal installation is easy, since you cannot use a seal driver because the snout is in the way, a wide punch (3/8") should do it if you work slowly around the edges getting it started straight and light taps careful not to get it cocked, until seated.
Crankshaft looks normal with the concave on the snout.
1953 Chevrolet 3100261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY GalleryVideo of the 261 running1964 GMC 1000305 Big Block V6, sm420, the next cab off restoration
