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This shot shows the adapter plate in place on the manifold, topped by a tapered spacer plate, and finally the carb baseplate. A variety of adapter plates are available at your local performance equipment outlet and range in price from $12.75 to $55.00 depending on the application. Trans-Dapt PN TRD-2044 adapts a Holley two-barrel to a single-barrel manifold for $32.95. Trans-Dapt PN TRD-2065 adapts a four-barrel carb to a two-barrel inlet for $14.75.