what makes a car a "SURVIVER" ?

I JUST PICJKED UP A 1972 PLYMOUTH DUSTER THAT IS IN AWESOME SHAPE FOR THE YEAr. A FEW SMALL RUST SPOTS, BUT I DO NOT THINK THE car was ever touched besides for the stripe kit . i say that because the car is a 340, but the transverse stripe is not on the car, and the fender tag says that it should be.
it is a numbers matching, with the engine and trans out of the car. but the engine looks as though it has never been touched. still reatains all the factory correct for that year. so i assume. i do not know if the 72 duster came with a carter afb carb?.

also, the engine build date looks to be either 8/29/71 or 9/29/71, would that make this a high compression engine or no. is it juast the emmission special for 72 yyear?lol

i cannot see that the car was ever repainted at all, and the interior is all original, except the previous owner ripped the carpet out., and the headliner is not the greatest, but presentable. the seats are in mint condition, and have not been recovered.

one last thing, how would i know if it had the sharktooth grille from the factory? as it has a almost mint grille. also, the stripe at the back of the car has a looks like a whirlwind, as it is a twister stripe kit. did the 72 come in a twister??????????????

so, i am wondering at what level is a car considered a surviver. if the pinstripe has been replaced, is it still a surviver? how bout the carpet???????????????? any input would be great guys/gals

so, tommorow, i will be posting pics of my new toy, and sharing with you fine fellas.