New cooling system, still overheating.

So, I had my engine rebuilt in Jan 2012. Put about 15 - 20 thou on it. June 2013 it iverheated because the radiator went bad so I put in a 26 inch 3 row Champion. Then a few weeks ago I started seeing rust in the coolant. Then full on blockage as top tube could not push coolant into rad.
So, buy another radiator, change thermostat, put on brand new water pump. New top tube and lower tube this weekend as well.


Still overheating.

Although now, top tube is just barely hot and bottom tube is just warm, so that lets me know rad is working.

Sounds like I have a busted head gasket to me but I wanted to run it by others.