Dumb Timing question?

Just went out to check the timing on my 360 (LA) and I rotated the Distributor clockwise and counterclockwise. While I was checking with the light, I didn't see a timing mark at all. After coming in the house I realized that I didn't disconnect the vacuum advance. Would the mark not show up just from not disconnecting the vacuum advance? I checked TDC and the Distributor lined up properly. Car fired right up. What do you guys think.