I'm taking a guess on the positions of the codes you listed
WS23 = Coronet R/T 2dr HT
83 = 440 4bbl HP (370hp)
5 = 3 speed Auto Trans
44 = F70x14 Redline steel belted tires
C14 = scheduled production date = Dec 14, 1967
057716 = Sales Order Number
9 under the 1 = Wide Sill Mouldings
5 under the 2 = Drip Rail Mouldings
8 under the 7 = Wheel Lip Mouldings
48 = 3:23 Sure Grip 8.75 rear end
S6X = Black Sport Vinyl Seats
WW1 = Monotone paint White
B under the U = upper door frame color = Black
B under the S = Black horizontal stripe
2 under the R = Radio music Master 2 watt
6 under the Y = Black vinyl top
6 under the a = center console
4 under the b = bucket seats
7 under the h = fender mounted turn signals
6 under the m = drivers side outside remote mirror
Frank
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