Survivor? original? Or numbers matching?

numbers matching is all numbered parts are on the car, i.e. motor, tranny, and the dash VIN, fender tag, build sheet and all body numbers match.

survivor is usually 85% paint plus all parts correct. normal replacement parts like belts, hoses etc are allowed to be replaced for driving safety

restored is all correct parts are there as if came from factory. not necessary for all to have date codes correct - just look correct

any car could have had a cracked manifold and be replaced for the car to function and still fit restored, survivor categories. if the part came from another car with same vintage and had correct dates to match original - then still original .

just my opinion