thanks for the suggestions, gents!
I tried moving the engine around a bit with the Napa mount still there, but it didn't make much difference. So, I removed it and reinstalled my old Ford mount. That eliminated the major vibrations and basically got me back to pre-Napa pre-CarQuest condition. But, I still get a pretty bad vibration in reverse - ??
(and by "pretty bad", I mean like '78 Camaro with stage-2 cams bad!)
P.S. whynotthinkwhynot - did you find that alignment procedure?
"I'm jealous of girls because they get to wear dresses." (Todd Flanders)