Left for Dead 68 Barracuda Buildup

I haven't personally seen one come apart. I can see how the risk could be
greater being fiberglass and 40 years old.
If I do buy one I will certainly inspect it very close before deeming it useable.
I have looked at a few fans that I have around here and the best I got is a
7 blade aluminum made to work with a clutch. I am not sure I have the room for
a clutch or if I would want one on this engine.
An aftermarket fan I have is rated to 6500 rpm and has a small bend at the end
of one of the stainless blades. So I ruled it out.
The reason I have been looking for a fiberglass fan is mostly because many
engines like mine used them back then.
Seems logical that they quit making them for a reason. Safety issue or to lower the cost to manufacture?
I have seen a couple hoods where a blade had sliced thru the steel.