Hmmmm...
'57 up later 2 or 4 barrel intake will physically bolt into place on the '54 239 / 256, BUT I believe that the port alignment will be marginal at best. A set of intake manifold gaskets for each application would confirm this.
IMO, a better way to go would be to secure a '54 Mercury or '55 Ford or Mercury 4 barrel intake. Adapters for the later style four barrel carburetor base are available from 'Speedway Motors' in Nebraska and Charlie Price's 'Vintage Speed' in Florida.
The earlier four barrel intake manifold will preserve port alignment and with the smaller cubic inch engine, the smaller intake ports should maintain low speed throttle response.
Food for thought.
