The Cowl tag gives the Model series, the Body number, the Interior Trim combination, the Paint combination, and certain Factory Accessories. For the 1955 and 1956 cars, the Cowl tag is located on the passenger side cowl, and if the car has factory Air Conditioning, it will be on the driverside cowl. The early 1957 cars had the tag in the center of the cowl, behind the distributor. Later cars moved it to under the heater hose inlet. Suffice to say that the Cowl tag should be intact.
All radiators have a Date Code on the top tank.
Amber turn signal lenses are a modern day replacement. They all had metal caps. Only the single 4 bbl units had the 'snout', and the shape of the snout on all 3 years air cleaners are slightly different. Spark plug wires were black, and so were all boots and nipples. No parts of the engine compartment were originally chromed, and this includes the hardware.