Guys, Jacks engine is not in the car. I use my impact, but have used a 2 X 4 between the crank and the block, with a breaker bar when I've had to. The problem with doing it that way, unless the block is secured to a stand of some kind, is that the block wants to roll over as you put the beef to the bar.
But, in another post, I see he took bits to the machine shop, so I would guess he got the damper bolt off.
Jeff