Over Heating

[Mr2_3SGTE]

Ok my car is over heating and I have replaced the following worn/old parts on the car; spark plugs and wires, all coolant hoses and tubing, waterpump, timing belt and tensioner, radiator, thermostat.

Worst case could it be head gasket, cracked head or what... little help?

if so whats the average price range to fix that?

its a 1990 Toyota MR2 GT Turbo Hardtop(JDM)

[MR2Jedi]

Check for coolant in your oil. If none, it's prolly not the head gasket. You'd also smell coolant burning(sweet smell).
Have you evacuated all the air from the cooling system? Bled the heater core? Air in the cooling system can cause overheating.