1969 RS Z/28?????

[69SSRSL89]

Hello, guys I just wanted to get your opinions on something. A good friend of mine has a real 1969 RS Z/28 that is garnet red with white stripes and black standard interior and a real X33D80 car. It has a CE replacement DZ block that it a couple months newer than the car since the original owner blew it up street racing and it has a replacement M22 for the same reason. Other than that it's all original and looks to have had one repaint. He asked me what he should have it insured for? I told him she was way under insured and I gave him my thoughts on what it should be valued at, but I thought I would get all of your opinions. To make sure that I'm in line. Here are a few pictures of the car. Your thoughts and opinions are appreciatted. Thanks guys Jesse