The generator matrix

 1  0  1  1  1  6  1  1  2  1  1  2  6  4  1  1  1  1  4  1  1  0  1  1  1  1  1  1  0  1  1  6  6  6  4  1  1  1  1  1  0  0  1  4  6  1  1  1  1  1  2  1  1  1  1  1  1  1  1  1  1  1  1  1  4  1  4  1  2  2  2
 0  1  1  6  3  1  5  4  1  2  7  1  1  1  0  1  6  4  1  7  2  1  1  7  7  1  3  0  1  5  2  1  1  1  1  0  3  5  6  7  1  2  1  1  1  0  6  4  6  0  4  2  4  2  4  2  4  6  4  4  4  2  6  2  1  3  1  5  4  4  0
 0  0  2  0  4  0  4  2  2  2  2  6  0  2  0  6  6  6  0  4  0  6  4  6  2  2  0  6  2  0  6  2  4  6  6  2  6  6  2  0  4  4  0  4  4  4  4  4  4  4  4  4  4  4  2  2  0  0  2  6  0  0  2  6  2  0  6  0  6  0  6
 0  0  0  4  4  4  0  4  4  0  4  0  0  0  4  0  4  0  4  4  0  4  0  4  0  4  0  0  0  4  4  4  4  0  4  4  0  4  0  0  0  4  4  4  0  4  0  0  4  0  4  0  4  4  0  4  4  0  4  4  0  4  0  0  4  4  0  0  0  0  4

generates a code of length 71 over Z8 who´s minimum homogenous weight is 68.

Homogenous weight enumerator: w(x)=1x^0+123x^68+168x^70+113x^72+56x^74+47x^76+2x^92+2x^96

The gray image is a code over GF(2) with n=284, k=9 and d=136.
This code was found by Heurico 1.16 in 0.165 seconds.