Becky,
If your 74 has no coolant overflow reservoir tank, then the radiator isn't supposed to be full to the brim, it's supposed to be about a half inch below the rim of the inside of the filler. This is to allow for expansion of the coolant as it warms up. This also means that a proper pressure release type radiator cap should be used, so that the lever release can allow you to safely discharge the coolant if she overheats.
If you didn't bleed the coolant out of the automatic choke hoses for air bubbles, you may still have some air in the system. If the radiator is clear of obstructions, and all the main hoses are not rotted inside, and the good parts are still doing their job, Then it's time for a real pressure check of the cooling system, and ultimately the head gasket leakdown tests.
Fingers crossed,
Pintosopher