The modern parts that are available are not being manufactured to 1950s Chrysler print specs as they should be,
and have not been manufactured to proper specs for many years.

Specific processes were used back then that carried over until the end of the big block run. It seems like a cheap part to make but it's
not just a machined part.

In classic fashion: Chrysler will not share the print with anyone, specs are proprietary, so there is just about no chance of anyone
attempting to make the part properly since they don't have the right information.

Years ago held the historic print in my hand and had samples of oe spec+ the common garbage on hand. The common garbage is machined and
missing the heat treat and so forth. There is nothing mysterious going on there somebody doesn't know how to do, it's just that nobody does it.