yes that car is worth 6000 easy. I own a 510 as well and that one puts mine shame its so clean, even if it does have a rotary. the most important thing in buying and old car is to start with a solid body, espically on 510s where they dont make reproduction body parts. The only way is either used, NOS(try like 600 for a fender and 325 for a valance on average), or fiberglass that is ment for race cars and does not fit to oem quality unless you put in serious hours in fitment. I paid nearly 4000 for mine three years ago and i can watch the ground go by as i drive.