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Overheating Ford 390 engine in 1963 Thunderbird

In the process of restoring a 1963 Thunderbird convertible and I need some help isolating an overheating problem at highway speed. 

Status to date:

1-No apparent coolant leaks.

2-No heating issue at idle.

3-Heat sender seems to be operating fine.

4-New thermostat opens and pump is circulating the coolant.

5-Checked for head gasket leaks using block tester no combustion gases detected.

6-Radiator appears to be in good shape.

7- Radiator fan has excellent air movement.( There is no fan clutch)

8- No sign that water is getting in the oil.

9- Radiator hoses and belts recently installed.
Any ideas would be appreciated.

Thank you

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