I haven't ridden the spectrum ride, but have dabbled with a few races this year. There's only one way for you to really answer the question you pose, and that's to do a race. Depending on your circumstances, I'd strongly consider signing up for a race skills clinic too - I was fortunate to attend a couple of the early bird crits this year, and the lessons there around how to ride safely in a pack, keep your line, hold a wheel while guarding yours, corner 2-3 abreast etc., etc. were invaluable. I'm sure you're strong enough to race, but it's the other skills that will really define how "ready" you are.

Good luck and have fun.