With the bike on the stand, the front should be in the air a couple inches. Of course, if the balance is off, the rear will be in the air instead. :-)
I did the same with my 84 R100 - left the repair a bit proud with the idea it would eventually settle a bit. Took a long time, but now it doesn't come off the stand by itself. For a long time I strapped the stand to the header cross over just to make sure it didn't come down on its own.