Have you tried using any air tools?
I work at a shop and we had a 4age block and we couldnt get it off at first. We actually had an air gun going for about 2 mins before the impact socket shattered. We then went and and found the most powerful air gun in the shop and some forged sockets and it came right out. You then pry the pulley off with a pry bar.
If you cant get it off just bring the part to a shop and see if they can do you a favor and take it off.
I work at a shop and we had a 4age block and we couldnt get it off at first. We actually had an air gun going for about 2 mins before the impact socket shattered. We then went and and found the most powerful air gun in the shop and some forged sockets and it came right out. You then pry the pulley off with a pry bar.
If you cant get it off just bring the part to a shop and see if they can do you a favor and take it off.