thanks for the suggestions.
Before I installed it, I compared the rubber on the Napa & factory mounts. The Napa was hard as a rock.
I'll loosen the bolts and see if the engine settles into a new resting position, but there's only about 1/4" of leeway in any direction from the center of the mounting holes. I'm not optimistic that a quarter-inch can make much difference.
Also, I'm seeing conflicting advice about torquing the bolts: some FF posts suggest leaving the engine supported by a jack for the final tightening, whereas my Haynes manual says to let gravity do its job.
"I'm jealous of girls because they get to wear dresses." (Todd Flanders)