Pinching is definitely the cheaper option, and probably all you need to do. Make sure you get a good look at the crank pin and connecting rod once you have the motor apart as well just to make sure you didn't damage anything.
You can buy stock pistons and sleeves from A-Main as well for around $110 if you feel like you need to do that.
If you have the engine apart anyway, it might be a good idea to put TKO ceramic bearings in the motor as well since the stock bearings can fail if the motor isn't broken in properly. About $40 buys you the pair.