All my old shop manuals say that #1 upper main bearing is not interchangeable with 2-4-5 on 440's. Darned if I can see any difference in the uppers at all except #3. I read someplace that Clevite makes them all chamfered now so they are interchangeable. Any ideas before crank goes in.

After almost 71 years I am on my last car. A 65 Plymouth Satellite straight axle altered wheel base car.