Do I need a hardened intermediate shaft for a HV oil pump?

Good info to have. I got to thinking about my experiences and they were NOT on Chrylser SB's. Excess oil pumping to the head depends both on the oil feed system AND on the drainback system. So I am starting to be a believer that it won't happan on a SB like this one, especially with the time-limited oil feed to the heads on this design; the other engines had constant head oil feeds and were OHC designs.

Another light bulb has lit; thanks for the education!

Edit to add: Are there any full groove cam bearings used for this engine that would make the oil flow contant to the heads?