I have never seen any 68 RR's produced later than 7/12 at the STL plant and 7/17 at Lynch Road. Are you sure this is a 68 produced in August of 1968 or was it produced in August of 67? If it is a 68 produced later than 712 or 717, it would be great to see a picture of the tag. The first non prototype 69's I have seen carry 801 SPDs so it's hard to imagine 68 model year cars were still being produced in August of 1968. Any pictures of this engine? Hard to imagine that an engine would be blue when the standard for 68 is turquoise.