The mounts have a short ear and a long ear with the holes that attach to the block. When installed on the hanger, the short end side should be forward.
PS: You might want to consider drilling some countersunk holes on the face side shown and putting some 5/16 reinforcing bolts through the rubber pad. Use Nylock nuts on the other side only snuggly tightened. Pics are in http://www.tigersunited.com website article on building a 350 Lunati motor by Tim Ronak. 🙂