I've used the Denso Iridium race plugs with good success instead of the hyper-expensive A55V plugs on my race bike. If that is the recommended replacement by Denso, I'd give it a try.
If you run iridium or platinum electrode plugs, start with the 0.035-inch gap that they are shipped with. Don't run them at the smaller 0.025 gap recommended for standard plugs or you'll loose throttle response.