The 52000 Power+Plus Cyclone Manifold is a direct replacement for the stock manifold on 1957-'95 Small Block Chevy non-EGR engines. Includes special adapter bushings to fit '87-'95 engines. Use the stock Quadra-Jet carb or 500-650 cfm vacuum secondary carburetor. Kit includes adapter plate to permit use of certain square bore style carburetors.info.