this is not on a dodge, but its a cooling system all the same and i am at my wits end. its on my 68 chevy (pardon my language) anyway, its a 68 bel air, 350 engine bored 30 with a mild cam, edelbrock intake and carb, and a/c, other then that there are no mods. the car came with a 327, and a/c btw.
Have you pressure tested the system?
Verified flow (even new pumps can be bad)?
Made sure that the stat is not installed back wards?
Checked the temp gauge for accuracy?
Running coolant?
Correct radiator cap?