'70 Challenger rear end vin stamping?

[CMF]

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Prior to the new theft prevention laws that started in 69 (which mandated the locking ignition switches on the column and CVIN stampings on the car bodies), you may find a sequence number there instead, which would match a sequence number on the broadcast sheet if you have one.

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I am almost positive that the stamping on pre 1969 mopars (b-bodies anyway) consisted of the following:
first digit- model year (6=1966, 7=1967)
second digit- assembly plant
third-fifth digits- scheduled production date
followed by the shipping order # (usually 5 digits)