Managed to complete the pathetic 1.25 miles of pace this weekend, wrapped up in enough walking to warm/cool to make it basically the slowest 5k ever run by man since time began.
Next day did as quick and up-and-back on Mount Beacon as I could manage 2 miles round trip, 1000 feet up, 1000 feet down, a little bit under an hour. I felt everything short of wanting to barf, so I'm not sure of how 6 miles of trail running is going to feel, though this certainly had more intense climbing than the "race" will.
Photo from the old hotel grounds at the shoulder of North Beacon Mountain:
Another of the old machinery for the long defunct incline railroad: