Mike, thank you so much for this careful research. This is incredibly useful for my situation, and also caused me to join the forum. I feel like I found a gold mine.
I installed a Hayden 2747 clutch in my 69 Catalina 400 yesterday. But after reading your post last night, I took it back out this morning and cut a new slot for the spring tang, as you showed in those pictures. I do not have a temp gauge on this car, but I can confirm that the fan is clutching up at lower temperatures and consistently declutching when it should. It's running noticably cooler across the board (by sound). Today was 85F and sunny, AC on and car loaded with 800lb of passengers and cargo. Kept the heat under control at traffic creep and 75 mph cruise. Thank you again.
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