Head Gasket Leak???

I just got my engine back a month ago, I put it all together and put it in the car. The engine has 170 miles on it, and i noticed that there is coolant dripping off of the little tab that sticks out of my head gasket on the the drivers side. I have Cometic MLS head gaskets, does it take time for them to seal, or do i have a problem..??

Thanks,

Brent