A kit for the standard rigging on my 27 footer, including forestay, backstay, and uppers, is $580. It includes all 316 SS, swaged fittings, turnbuckles, toggles, and cotter pins. Similar kits for forward and aft lowers are about $140, so call it $860 all told.
What the kits do not include are adjustable backstays, running backstays, inner forestays/babystays, or any modifications that would be required for furling gear. Also this is a single-spreader masthead rig. Looks similar to your boat.
It also doesn't include labor. Are they quoting parts and labor or just parts?
1972 Catalina 27