68 Polara steering pump

I'll keep it short as I guess there is a simple answer to this one. My old steering pump was leaking bad so ordered a new one, looks good, exactly the same (Cardone) but it came without the pulley, so I tried to remove the old pulley, heard it was just a press on type, but the thing didnt move, and is now damaged, due to clamping to hard in the vice!!! darn!!! Question is where to find a new pulley and how do you get the thing off?
There is a hex nut on the end of the shaft, does this need to be loosened or removed before pulling?
Author: Polara-Lee