The generator matrix

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

generates a code of length 77 over Z8 who´s minimum homogenous weight is 71.

Homogenous weight enumerator: w(x)=1x^0+178x^71+334x^72+422x^73+439x^74+426x^75+291x^76+424x^77+279x^78+254x^79+229x^80+174x^81+167x^82+128x^83+87x^84+80x^85+57x^86+64x^87+22x^88+4x^89+10x^90+22x^91+4x^92

The gray image is a code over GF(2) with n=308, k=12 and d=142.
This code was found by Heurico 1.16 in 0.726 seconds.