That's a pretty long climb. Rise/run makes that climb approximately a 2% average gradient (assuming it's a steady incline). I don't know about you but I would be more focused on stamina first before focusing on how fast I could climb because 170 is a pretty lengthy ride.
Congrats on getting faster.
edit: If this ride is like next week and you don't have a good base, it's going to be hard regardless. Good luck!