Simple answers:
1 - The overclock is possible - there are many factors, but just try it (always watching the temps). If it doesn't work, you can either lower room temperature, or go for higher end cooling.
2 - Room temperature is quite variable. A CPU running at room temperature when the room is 150deg wouldn't work too well

. A CPU running at room temperature in an air-conditioned room would work quite better

.
80deg F is a pretty good temp esp if at full load. If you could maintain that you have a good
chance at a decent overclock.
I assume you will be running a higher end heatsink with some Arctic Silver 3, etc.. ?