Yes on the power steering cooler.
RH manifiold is casting number 2863549
LH manifold is casting number 2863553
They are the same for any 1970 340 weather from a Dart, Duster, Challenger or Cuda. The manifolds from 1968-69 will also work, but the driver's side has a large embossed casting number on the earlier one, but some of the early style were used in 1970 as well.
I may have a passenger side one here, I will can look if you need one?
Barry