Do your fan/fans work?
Is one of your radiator hoses crushed?
What is your coolant level at?
Where is your timing set? is it advanced?
Have you done a compression and leak down test?
How old is your 02 sensor?
How old is you cat?
When did you last replace the tranny fluid?
No creamy oil? ok how about your coolant, anything funky looking there?
Does it over heat when idleing? Driving normally? Driving at highspeeds? Driving aggressively?
Is the theromstate in the right way or backwards?

Awnser that and we will see what is going on..