The generator matrix

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

generates a code of length 70 over Z8 who´s minimum homogenous weight is 68.

Homogenous weight enumerator: w(x)=1x^0+248x^68+112x^70+95x^72+16x^74+24x^76+15x^80+1x^88

The gray image is a code over GF(2) with n=280, k=9 and d=136.
This code was found by Heurico 1.16 in 0.605 seconds.