so I would be at a heat load of 70 KW per rack rating.

What is your proposed cooling arrangement, that's one hell of a density.
The specifications suggest those PDUs downrate to 24A for 24/7 usage, so keep that in mind. It makes them an awkward size as you'll only get 1.5 SP35s per PDU. I am unsure if there is an alternative though, hopefully someone will be along shortly to help.