What kind of documentation for used engine would satisfy you?

If you were to consider buying a used engine sitting on a pallet, what would you want to see before buying it?

I will be selling my Magnum 300 crate engine in the very near future. It runs absolutely great…but no potential buyer can (nor should) just take my word for it obviously.

Ordinarily, I would be able to take someone for a ride but they have salted the roads up here in CT many times over so that’s out of the question.

Someone could come check it out and hear it run/idle…but if I don’t find a buyer before I pull it, even that won’t be an option.

Would a video of the car running be helpful? A video of a compression test? Those things could be faked but that would be an elaborate hoax.

Anyway, what would put your mind at ease?

Thanks for any input.
Buying it for .10 cents on the dollar would work for me