Artillery sidewinder x2 new extruder

I have artillery sidewinder x2 printer. I bought new extruder full metal version.
After fitting i have a problem with leveling.

I make auto leveling and manual but when printer start print nozzle is to high like should be.

Can someone explain my how to calibrate new extruder?

Also how change max temperature? My orginal was up to 260 deg new one is 300. But in printer i still have limit to 260.