Need some ideas on a vibration dampner that I can NOT get to budge!!

trying to tear down a 408 stroker for a friend, and I cannot get the vibration dampener on the crank to move. I tried my slide hammer, but I couldn't get a good attachment point to it with the crank pulley bolt holes. might have to fabricate a plate to pull it. hope not though, that's a lot of time and effort just to pull it off!

tried beating the outer ring with a hammer, but...I think the dampener is, well...dampening the hammer blows!

I'd like to add some heat to it, but A--I don't want to hurt the crank at all, and B--my torch hoses are dry rotted and cracked after just 4 years, despite being inside the whole time!!