Found a crack in mine a few weeks ago and thanks to the people on this forum I decided to get the aluminum fan. I got mine from Snyders and it fit perfectly with no rubbing on the pump.
I've had time to really look at the original fan and can see the time bomb they can become. It's interesting how they decided to make the fan with the folds in it. It's also its downfall as it's easy to see how they can surprise you with the fan blade coming off and going through something.
Here's a link to the thread I started with some photos of what goes wrong with original blades..
https://www.fordbarn.com/forum/showthread.php?t=270969