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

On a new, tight engine and a HV oilpump you might end up with too much oilpressure, depending on the oilweight you use because the oilpump can't 'get rid of the oil' fast enough so pressure could rise.

Be prepared to switch to a thinner oil or weaker pressure-spring in the pump after the break-in if needed.