Nice car, but I would be very suspicious of that mileage. Looking at the steering wheel and the missing paint under the shift lever, I'm guessing that car has seen a lot more than 22,000 miles. Also, look at the difference in the chrome trim on the door panels between the driver and passenger doors. The chrome on the driver's door should look like that on the passenger door on a true low-mile car, but it's completely gone above the arm rest and along where an arm would be rubbing for a long time. I couldn't get a good look at the brake and fuel pedals, but be sure to take a close look at them when you inspect the car. If you see any signs of significant wear on them, then you'll know for sure.
I've never seen a 73 road runner with the running bird and metal road runner badging on the C pillar like that. I have seen some that had the stripe delete that had just the running bird decal, although it's placed a bit higher than where this one is, but I've never seen a 73/74 with a vinyl roof that had the decal on it. The metal road runner badging on the trunk lid is correct, but the standing bird decal should be centered over it. Also, the car is missing the standing bird in circle decal on the front, so taking it all in it looks like whoever did the repaint didn't have a clue what road runner markings should be on the car and made a bad guess since it looks like they got everything wrong.
Missing bumper filler strips are common and cost about $80 to replace. I was going to replace mine but I'm pretty tall and having the strip missing makes it easier for me to put the gas cap back on since I can see the filler neck through the gap.
As to its worth, there are several considerations. First, I would bet that mileage isn't close to being right. Second, the definition of a "survivor" isn't very standardized, and many would consider a car that's been repainted, has some bodywork, a new top, has a new manifold/carb, valve covers, wheels, headers, stereo, etc., as not being a survivor. A survivor is generally considered to be a car that's exactly as it was when new without being restored, and that doesn't really apply to this car. "Numbers matching" is more of a value-added proposition when you're talking about rare or limited production drivetrain options, and this car is the basest of the base in that regard. If the car were a big block or 340 car with a 4-speed, numbers matching would add to its value, but with a 318/904, it's really just a hype item for the salesperson. Lastly, the interior is in good shape, but it is a bench seat with a column shifter, which is also the least desirable option.
I wouldn't go more than $4,000 on this car.