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Here's another two cents worth...
How tight? Well, if it's not enough you will suffer.
When I disassembled my 35 Fordor prior to a 2k mile road trip last summer for a "simple" wheel bearing service I found the driver side key sheared in half. That explained nicely why the nut came off so easily. I'm sure glad I thought a bearing grease was a good idea! It took me about a day to get back on track for the road trip, but I've still gotta tear that rear apart again this spring.
I like driving for a hundred or so miles and test if they will go another castle cutout. When they won't move any more, you're done.
They are about 3x tighter than any other fastener on the vehicle. Upwards of 200 ft./lb. is in the right zone.