The pulley is a tight fit onto the tapered end of the camshaft. You need to buy/borrow/steal a puller. Or make your own with a hardware store plumbing fitting.
Look in the 164 section of the BB for one of Alfisto Steve's threads. I borrowed his idea of making the tool with a pipe flange. It just happened that the large bolt from my pittman arm puller fit the threads of the 1/2" pipe fitting. I drilled the holes in the flange to fit the three bolts in the pulley hub.