[Purdy Swoft]

The repro aluminum original look alike fan would be your best bet. More fan blades are not going to help cooling at driving speeds . The fan is only needed at idle and low speeds . I would get rid of the 50//50 antifreeze and only use antifreeze in winter . Antifreeze raises the boiling point to way above 212 degrees but doesn't cause an unpressurized cooling system to run cooler . I run tap water in mine for over 50 years with good results . Water cools way better than a fifty fifty antifreezw and water mix . If you are worried about rust, run a small bottle of water pump lubricant in the radiator . Water pump lubricant will lubricate the water pump and coat the system with enough soluable oil to help prevent rust. Ford recommended full advance at speed . Fifty five and sixty MPH is probably above what was considered speed in the model A day. Running at speed with the spark lever half way up the quadrant for much distance will cause over heating . One hundred and ninety drees was considered running in the danger zone for the model A . I prefer mine not to run much over one hundresd and sixty five degrees. I've had good luck with my model A running in this manner fore most of my life . Good luck with yours .