By Scott Bidroski The Gordon-Rushville Mustangs had one final tuneup before they jump into the postseason of the 2024 Track & Field season.A quick trip down Highway 20 to Valentine for the annual Greg Gass Invitational was on the schedule and the team made the most of blustery, cool May morning.Three Mustangs would earn gold medals on the day in Valentine, helping bolster their resumes…