Picked up some parts at lunch

The headers are Clifford "long tubes". They look like the early build for a early "A" body. The early build Cliffords have longer collectors, then the later build. I think I see a white sticker on the collector. What is the number on that?
The number on the box and the collectors is 550016. Everything is new in the boxing has the gasket, collector flanges and hardware! Theres even a sticker and instruction sheet in there!

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