HDK w/ Big block

Hi all. I have a 71 dart with a 440 race car that I installed the HDK front end in last winter. I used Andy F's motor plate, which mounts the engine at factory height and when I went to install the rack using the HDK provided spacers, the rack hits the pan, Milodon center sump 30931. I removed the rack spacers so I could race, but now during the off season, I would like to figure this out.
Can anybody measure and tell me how high the big block in their a abody is from the HDK k member?
I have looked at Younggun's install thread and he uses the HDK motor mounts and his rack fits fine with the spacers.
I also have a bump steer problem. Would that be caused by the rack being too far forward?

Thanks for the help,
Mike