From the website,
"This will be Stockberger's third straight year at FOM. He set personal bests each of the last two years, 4:01.39 in 2013 and 4:00.06 in 2014. This year he is set to pace the field in an attempt to break the meet record of 3:54.27"
The field also includes, Jordan McNamara 3:52, Doug Benson 3:42 1500m, Travis Burkstrand - 4:00, Ben Bruce - 8:19 steeple, Tyler Pennel - 4:01, Aaron Braun - 4:01, Tommy Schmitz - 3:56, Jack Bolas - 3:57.
I say at least 3:58, field is set up perfectly and the weather should be great. If you are in the St. Louis area, it only costs $5 and the stands are always electric.