I've got one of those bellhousings, complete with clutch throwout lever, bearing carrier and block braces for $200.
I also have one setup with a W57 gearbox, where the bellhousing has been machined down 5mm to get the inputshaft to locate in the spigot on a 3SG. $500 for that setup.
Also custom made billet steel flywheel to make your Gen 2 or later 3SG work with the W57 gearbox and bellhousing. $450.