Hi and welcome. The Stonehorse 23 is not a boat with which I am familiar. It does, however, bear a striking resemblance to the Hood 23 which has become a classic staple of Australian small boat sailing. I cannot tell you much about wooden masts. I owned a 32' Piver trimaran at one stage and it had timber spars, but they had been restored and gave me no trouble at all.
I agree that a boat designed to carry timber spars should live her life in exactly that livery. The bottom line is that you may need to drop the mast and have a good close look at it. Make sure the fittings are soundly attached and be prepared to get stuck in to the job with Everdure (or a similar wood hardening product). You will need to keep a close eye on the spar on a regular basis. I wonder if the mast and boom are coated with urethane or paint. Clear coating is beautiful...painting is a good option for those who prefer to spend all their time sailing.
Please keep us informed and post a few photos. Hopefully Redbopeep will make an entry (wooden spars and loads of knowledge). In the meantime, congratulations on your new boat and I sincerely hope you have fun sailing her.
"if at first you don't succeed....Redefine success"!