Better pics would be cool - I'd like to see those. Stock was 235hp; if you got the polished/ported heads, polished/ported intake, and hotter cam, then you're good for around 280, with the AMG low-restricted exhaust you can get close to 300hp. That's the setup on my car. Mine's got the full body kit, but yours only has the front airdam. It's a lot like this setup:
1982 AMG 500SL MERCEDES
That one posted above is also a real AMG - how do you know yours is a factory AMG? I'm always curious to the "clues".