'75 400 and 727 what are they worth?

Yeah, it's hard for me to offer anything more than around $500. I still view the motor as a core. Who knows whether the guy knew what he was doing? He claims he builds a lot of chevy motors, currently doing a 283, but I don't know how it would run. I guess I would take a gamble if the price was low enough. But he wants to sell both together.
Am I nuts?