The generator matrix

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

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

Homogenous weight enumerator: w(x)=1x^0+74x^68+88x^69+99x^70+74x^71+56x^72+42x^73+23x^74+18x^75+9x^76+13x^78+11x^80+2x^81+1x^86+1x^88

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 0.0793 seconds.