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Get a meat thermometer and test the temperature before buying a new radiator.
Moto Meters are a neat accessory item but not usually very accurate.
You/we need to know for sure what the temperature is before going too much farther.

How is your timing set??
If it is retarded it will cause overheating.

Had a friend purchase a new radiator because his car was overheating similar to yours.
I set the timing correctly before he installed it and he was able to send the radiator back. Saved a lot of $$$'s.