It looks to me as if the bottom pulley was an aluminium one that didn't fit, and it has sprayed pieces of aluminium over everything as it chattered on the shaft. You will need a new lower pulley. I can't tell for sure whether the crankshaft steps up in diameter at the bottom of the upper pulley. If it does, once you clean up the flakes of aluminium that are coating the joint between the upper pulley and the shoulder on the shaft, and soak the upper shaft with penetrant, it should pull off fairly easily. If there is no step in the crankshaft, you will have to pull the upper pulley all the way to the end of the crankshaft with a puller, and that will only be feasible if you do some restoration work on that lower part of the crankshaft first. Pushing the pulley a bit further up the shaft will tell you for sure whether there is a step in the shaft, and will also let you clean up the shaft and shoulder before going to work with the puller.
Short summary: I agree with Bob.
