BB intake manifold help needed

I'm looking for the correct intake manifold for a 67 383.
From what I have found out the correct casting number is 2205968.
This is correct for '62, '63, '64, '65, '66, and '67 383 engines with the single four barrel.
The problem is intakes with the same casting number look different, and the so called date codes don't appear to be dates at all.
Here are 3 on eBay right now, the first 2 look the same, except for a few casting marks, and the third one is completely different.
The date codes on these are some wacked out system, 2-3, 9X22, and 12X6????
I've also seen 5-3, 10X15, and 9-2.
Can anyone help?

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Author: admin