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Do you think this equipment will be sufficient enough to get some good quality action shots?
The 5D2 is ok for action shots, as long as you've never used a 5D3 or 1D series body. The resolution and ISO performance are good, but the AF acquisition and AI Servo tracking are lacking.
You'll do fine as long as the games are during the daytime.
For best results, use the 100-400 and set your camera to center point focus with AI Servo. Use M, expose for the faces, and keep SS around 1/1000". No need for IS at those shutter speeds.