Welcome from Wisconsin. It sounds like you've already dug into it pretty good! The biggest differences between the 1100's and 1000's are the carbs, cams, and ignition system. It's difficult to say what's been done with no clear record, but there are a few things to look for. Obviously, you've done the carbs, so you should know if they're 1000's or 1100's. The cams could be either, but the easiest way to tell would be if the bike is using the 1000's ignition system, which is either points or an aftermarket electronic system that runs off the left cam. The 1100's have a factory electronic ignition that runs off the back of the engine, and separate 'spark units' that would have been wired into the wiring harness. The 1100's left side cam has no provision for using the 1000's ignition system.
All that said, if you've got 1000 carbs and cams in the 1100 engine, mated with the 1000's final drive, as Eric says above, it should be a hot ride!