The 'Good Luck' was sincerely meant, and with me not being a purist (can't afford it), that means I'm sure the car is more of a blast to drive now - than when it was a 380. Ever consider selling the 'boring' car and keeping this little rocket ship for yerself?
From a buyers perspective, if the engine miles are unknown - but well over 100K, a primary concern would be to determine whether the 500's chain rails, guides, etc., got redone when the engine was put in. If you search the board here, you'll find that is really the only
point of weakness (being plastic) these engines had. And @ 100K is the recommended service interval. When I bought my car with 200K on it & no receipts - that's the 1st work I ordered done.
My best to you & your wife... I'm sure she'll miss driving this car