I sent a 489 pig with a clutch posi and 4.11 to a high school kid who needed something to wake up his car.
I got the " novice to the sport " vibe from him and I let him have it for the price of the ride to Belvedere , Il.
Never heard back , but the gear was beyond what I would use and I was switching to a 742 case , so he just saved me from tripping over the thing till I found another home for it.
Hopefully , he learned something.
I prefer to think that over the idea that some one older used a clever ploy , sold the part and had a good chuckle at my expense.
I haven't been burned bad enough to matter in any car dealings.......I could usually recoup some of my outlay and that cut down the price of the lesson I got.
But I am ( kind of like Popeye ) what I am , and will do what I do.
How others do their thing is up to them.