Only a few drops, that's better than normal. Ever watch drag racing, what do you think the guy with the rag is wiping off the ground while the funny car is backing up after his burnout? Consider it free rustproofing.
Did they cut the block and put in a one-piece seal, or just replace the 2-piece unit?
Quit worrying, you have what, a 550 Hp motor, in a car that everybody gives you the thumbs-up while driving, that is a chick magnet, and you are upset about a tiny
oil spot on the garage floor. It is 40 year old technology, they leaked then, and still do now.