Hi, what year is this kit? Does it have correct interior?
The model year is a hard question to answer for that particular box. I believe that box art was originally used for the '72 annual. It was brought back when Johan reissued the kit in the '70's, but various parts/model years were found in the box. I have one that contained a '73/'74 kit, and another that contained a '73/'74 body with '72 chrome.
Every '71-'74 Johan Javelin I've ever seen contains the same crude interior (about four pieces total) with an identical seat pattern. I have no idea if the pattern is unique to any particular model year.