overheating!!!! HELP!!!!

[69camarokid]

LT1's are hard to bleed all the air out unless you can pull a vacuum on the system when it is dry. The way I bleed them before I had the tool was to fill the radiator or surge tank until full, then open the bleeders until coolant comes out, sometimes it won't but the coolant level should drop. Close the bleeders and start the engine then open the bleeder at the water pump and see if any air escapes if only coolant come out, close bleeder, rev the motor to about 2k and even if the temp gets kind of high...say around 240 it will be okay as the bubble should quickly purge. Always seems that it gets kinda warm before it lets go but does do it with RPM up...it won''t if left at an idle.

tried this, but to no avail. The car still over heats.
dont know what to do. I never had this problem before
Ive heard there is an impellor in the water pump and that if it is lined up incorrectly then it would cause overheating. anyone heard of this or know anything about it?