Radiator Hose Question

The stock rad was trashed, that's why I bought the new one. Not a B-Cool but like one of those. The radiator is for a 71 Cuda, so it was a bit tall but I already corrected that.

I think I like 64 Cuda's idea of switching to the later model water pump. Can I just switch the housing or do I have to replace the whole pump?
I already scribed my timing mark on the balancer so that shouldn't be an issue.