I've been making something similar to this for many years. The bar I learned it from considered it a riff on a Manhattan and thus named it the "Port Authority, " which is too perfect a name not to share.
John Berges
Archibald's Last Memory 2
Fernet liqueur, Bénédictine D.O.M., Amaretto liqueur, Bourbon whiskey
Didn't have Marachino, so I substituted Amaretto to try to mimic the splash of sweet/nutty flavor. Served over a large ice cube, it be my new favorite drink.