While I do not have a sunshine, I do own an 85 Arcadia 30
, also a tony castro design built by Jeanneau. The look of the sunshine is similar to my Arcadia.
What I have found speed wise, slower than say a J30 for me, probably a J37 for you by about 20-25secs a mile in PHRF ratings, but when compared to a Catilina 30 or 36, about 40 or so secs faster. So speed wise, you will not be the fastest, but you definetly would NOT be the slowest fin keel built boat of the late 70's to early 90s built boats. I would figure 25-35% of the boats will be faster, 65-75% slower. Faster besides Jboats, would be the Ontario Canada built C&C's of old among others, slower Catalina, Cal, Islander, Newport, Benateaus cruising version, equal to a skoosh slower is the Benateau first series. As a comparison, my Arcadia locally is rated equal to a Cat and Islander 36's.
Nice design features include side shrouds hugging the cabin top for tight pointing angles. There are very few boats locally that can out point me. Cockpit mounted traveler for better control of the main, along with an adjustible backstay which was rather unheard of for stock boats at the time. Now adjustible backstays are std on most boats. Jeanneaus at the time were a bit on the front edge for introducing new features.
Build quality, better than most, not as good as say a J boat, C&C;s , but better than Catalina, Hunter and Benateau, on par with Erickson or Islander. Currently Jeanneaus are part of Group Benateau, the Benateaus are teh entry level, Jeanneau a step up, with Waquiez being anther step up yet, and one other higher yet, but I can not remember the brand.
My rig is a bit soft with winds, with 15knt winds, a main and 110 or the stock 140 and reefed main is in order with say a couple sailing her. With a race crew and a few folks on the rail, a bit more sail will work. The winches like a lot of boats of this nature, are ok for myself, my wife and 19 yr old daughter find them to be one size small. IE Genoa winches are nontailing 40's, ST 44's would be better or probably a ST40 would make it easier. The cabin winches are a dual 16 port and a single 15 starboard, with the 110 coming here, it would be nice to have 24's in my case.
Watch out for the headliner. I know of 4 arcadias from that era, ALL have had replacements done. The foam backed vinyl will come down if it has not already. Costly to fix, I was quoted 5-7000 locally here in seattle. I did it myself for about $1000 and 40-50 hrs of time. The Jeanneau owners site has pics and a description of what I did.
Hope some of this helps.