Congratulations! You have a great boat, a real classic little ship. The boat has the same interior as the Venture/Macgregor 22 but the rig and profile are patterned after the pilot cutters of the 1890s. The rig may be "old fashioned" but the boat is very fast, faster than any other Venture! I have been sailing my 1974 Macgregor Venture of Newport Chiquita for almost 40 years.
The smaller yellow sail is the jib and goes on the outer forestay. The blue striped sail is the staysail and goes on the inner stay. The yellow jib is the first sail that should be dropped as the wind pipes up.
As originally rigged, the boat had a single backstay that was offset on the transom to allow the tiller to swing. It did limit its arc a little bit. It may or may not have had pigtail to hold the boom up. If so, it should never be used with the sail up. It is no substitute for a proper topping lift which most of us have retrofitted to our boats.
You will find all the information you need, as well as hundreds of pictures of Venture 23s in various stages of restoration, at the Venture Newport Yahoo website:
www.groups.yahoo.com/group/Venturenewport
You can ask questions on the forum or search the archived posts. Be sure to browse both the Files section and the Pictures.
Henry