Built 340 stored 22 years suggestions

Pre-oil it with a oil pump drive while tuning the crank 1 revolution, then dump a pint of oil in the valve cover just before you start it---- fill carb and start it. Keep it running for 20 minutes at 15-2000 RPM, normal break in stuff. I wouldn't tear into it unless I had to, and how you stored it sounds fine to me.