If this is an actual Buick Skylark GSX, then it's a rare bird indeed. This top-dog muscle car from Buick would be one of 678 examples built in 1970. This one looked very nice indeed, looking through the glass windows.
The 455cu.in. V8 was rated at 350 horsepower, but it held one of the highest torque ratings of any car in it's time: 510 lb-ft. There was one option higher, and still more rare, the Stage 1. But I'll take a GSX spotting any day.