1989 Toyota Cressida Wobbly Crankshaft pulley

I have an 89 Cressida. Few days ago it started making a continuous clunking noise. On the road, it just stopped momentarily with the engine running and I had to pull away, turn off the engine and re-start again to get home. I took the very not smart approach and changed the water pump thinking it is the cause of the issue. However, after filling the anti-freeze and starting the car, I realized that water pump was not the cause. After recharging the half-dead battery over night and starting the car the next morning, I realized that the car idles fine and normal and the noise is still there. I checked all vacuum hoses for any possible issues and then paid attention to the pulley on the crankshaft. It was wobbling like there is no tomorrow and it was creating the noise. Can someone tell me what parts I need to change if it is only the pulley that needs to be changed? Or at least pointing me to a site where I can find info about changing the pulley.