It hasn't as much to do with equipment as you might think. It mostly has to do with the engine. The best way to test yours is to try some group rides that have riders of varying abilities. You'll not only get a sense of whether or not you're ready for both fast speed and changes in speed, but you'll learn valuable bike handling skills which should really be there before you start racing.

If you've been out on some group rides and can hang when the pace goes up, and can follow attacks, then I think you're ready. If not, try out some group riding first. Bottom line, don't fuss over your bike and components just yet. An Allez with Sora will do just fine to start.

Just my .02. Good luck with it whatever you choose, and have fun!