Does the 61 have a cross flow radiator??? and I want to know what the diminsions of the core are, how many rows of fins per inch, how many rows of tubes and the width of the tubes ( one inch, 1 1/4 in, 1 1/2 in), how high pressure cap , is it a closed system with a recirculate cap, and if you have put a thermometer in the water-----

Probably not in the 60s, but in the 70s Ford had some valves that when warm would change the vacume to the dist to manifold vac to increase timing which raised idle speed which increased water flow AND fan speed----

Your vehicle was designed with properly shrouded engine driven fan and without it your engine is going to overheat with an accessory add on fan---you need to use a complete package of an oem type fan package and it will probably draw more amps than your 60s electric system puts out---