It's the performance version of the Cutlass. There was fewer cars produced with bucket seats, console, floor shifter, t-tops, so that is why it can be harder finding parts for it. What parts are you looking for?
If the drive train is all original, you have the very wanted 200-4R trans with the 8.5 rear end. The 307 is the high performance version even though it still isn't that powerful.
If you want to add power to it, don't. They really have no potential without spending tons of money. Your best bet would be to take out that engine and install and Olds 350 or 403. They are a direct drop in with no modifications needed. That way if you ever want to sell the car, you can easily put the old 307 in and be able to get more money for the car because it is all original.