Idle the engine with the radiator cap off and make sure you see circulation when it warms up to verify the thermostat is functioning. If it is and you're getting good heat exchange off the radiator, I'd certainly drive it with some caution and limitations on how far away from home I got.
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Hoping to finish a project while I'm still able to push the clutch in.... 
1963 Tempest Convertible (195-1bbl, 3-speed transaxle. 428 RAIV, 5-speed, IRS planned) Pictures
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