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Take a look at this link. Take a look at the VIN of the car and you should see a C or J for the engine code. If It is anything else it is valued as what ever was originally in the car.
The car is totaly original except for the interior. That was refinished and a paint job and a 3:25 rear end. Other then that completely original with the factory 429
Well it still ain't gonna be cheap. I don't know the exact value of a '71 Mach 1, but I guess it could be upwards of $30k.... And I could be far off...
A factory 429cj 10k up easy if its a 429scj which is a drag package car those are rare and high dollar as hell.Get the vin and or the door tag info decode it here http://www.mustangdecoder.com/