Can You Help A Girl Out?
My grandfather left me his 65 when he passed, and it was give to me when I was 16.
(1983)
The first winter I froze to death in that car.
Come spring time the car kept running hot or over-heating.
The impellor on the water pump had rusted off.
Replace the water pump with a quality one, no problems after.
Also most early slants have no shroud.
How far are you filling the radiator? There is a plate when you look in the radiator, do not fill with antifreeze over this plate.
And last, put a new radiator cap on it with the correct pressure.