1995 Chevy Camaro v6 3.4l overheating problem

my 1995 chevy camaro has been overheating. at first i thought it was the thermostat sticking because there was no spewing or smoking so i changed the thermostat and my car was still over heating. I finally found out that the water pump was leaking fluids. so I changed out the water pump and filled it full of coolant. i turned on my car and within 10 minutes the gauge went up to 260 degrees and went down a little bit but stayed around 260, there was no spewing or leaking or smoking again. I was thinking that maybe now it could be the sensor but im not sure. what else do i need look for. please help.

Did you check the lower intake gaskets for leaking.....did you check the corners of the heads for leaking(could also be leaking internally, and burning up in cylinders)....

Did you properly bleed the air out of the system? If you didn't, this would cause an air pocket....

Are you getting heat out of the heater core? If no, then it could be plugged or air bound.....