Are you guys using the standard crank key? My 496 has a A-fuel crank so I think I will have ATI change the dampener inner to that key setup. Another thing is those darn B1 heads do not have mounting tabs locations so everything has to be done at the waterpump bolts with a little help from the motor plate, although the new big mount plate can also tie into the frame near where the motor plate hits.

See the mount in this vid:

https://www.youtube.com/watch?v=Vxd73dqVt2k