57 and 58 could be purchased "heater delete" A Custom 300 with heater delete sold on the Barrett Jackson auction.
Note, no hoses on the engine.
This car was built from a very dry, no rust '57 Custom from California. The engine was taken from a complete but rusty '57 "E" Code. Every piece of it was still intact including the air cleaner and carbs. No parts were added, but totally rebuilt and restored. It has some very hard to find NOS parts such as the radio, heater and clock delete plates and the heater block-off plate.