What kind of documentation for used engine would satisfy you?

I tried to sell our iron head 360 years ago for $3500. That was ready to drop in and go…. Carb, distributer I mean literally hook up, add coolant and go. This also included the mating 904 and converter. High 10s in our car…..No takers. I’m glad it didn’t sell. We’ve drug it out from the corner a couple of times to get us to the track when we’ve had issues with the fast mill.