To the casual eye, your machine appears to be a stock pre-L model built around March 1972. From the photo, I see a non-stock rear wing; that's the only apparent varient for those who want a completely stock red Pantera. I suggest removing the wing and offering it as an 'extra', plugging the wing bolt holes with temporary plastic plugs- red if possible. There is no history for #2670 in the original Registry but there were more '72 pre-L Panteras built than any other. If in fact it is rust free, running and drivable, without serious damage to body or transaxle, approx. $70k is reasonable IMHO. Good luck.