Your take on a potential trade.

I wouldn't even be considering a swap until you know what he's got and it's condition. You know yours. Is he willing to provide all the info and receipts? What is it? How old? Who built it? What pother parts in the driveline were upgraded for it? Are those included too? If he doesn't know, that's not his fault, but it's certainly a big risk to you. Even in terms of just having an engine in the car to drive around.