Clint, that 068 should be an 06B, which is the 2nd week of June 1966 car.
Best bet is to take a pic of tag and post if possible.
1966 Impala SS
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06B =======> Second week of June
66 ========> 1966
16867 ======> Impala SS two door convertible
JAN ========> Janesville, WI assembly plant
1735 =======> Fisher Body sequence number
837 ========> Blue vinyl bucket seats E E-1 =======> Danube Blue (medium blue), White convertible top
W =========> Group 1 Tinted Windshield
2L =========> Group 2 Four Speed M20
5Y =========> Group 5 Deluxe Seat Belts