Bill, I can't supply the stock dimensions, but would strongly suggest that you not trust them when ordering a
mainsail for a
boat that old. In thirty odd years, previous owners can make the most astonishing alterations in things, and even respected builders like
Cal sometimes make changes as the model matures.
All legitimate sailmakers will come to your
boat and make the needed measurements in situ. To do otherwise begs for an ill-fitting mainsail.
Cheers,
Jim