Opinions please

I had this same offer made to me few years ago. I went to the mans hose, he shows me a pile of rusted **** 383 and wanted me to rebuild it for him. I tried to explain to him that with all the rust I could see, It just isn't worth it and refused to take it. He wasn't happy but at least it ended there. Me in your shoes? Tell him $200.00 and he can have the motor. Or keep it.