Keep in mind you are trusting the info he says is true, I have never met anyone who can tell me with 100% confidence that is a stroker motor without tearing it open and measuring the internals
You can verify the headers, intake, alum heads, etc visually but not the motor itself. I wouldn't go over $1000 for that
If you can look into getting a title before you buy the car, then it could be a good deal. Although the two passenger side cobra emblems would but the s*** out of me.