The generator matrix

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

generates a code of length 80 over Z8 who´s minimum homogenous weight is 69.

Homogenous weight enumerator: w(x)=1x^0+74x^69+242x^70+496x^71+670x^72+1004x^73+1290x^74+1572x^75+1929x^76+2208x^77+2737x^78+2826x^79+2802x^80+2810x^81+2583x^82+2412x^83+2026x^84+1616x^85+1202x^86+780x^87+554x^88+344x^89+230x^90+152x^91+65x^92+60x^93+35x^94+18x^95+13x^96+10x^97+1x^98+4x^100+2x^101

The gray image is a code over GF(2) with n=320, k=15 and d=138.
This code was found by Heurico 1.16 in 48.7 seconds.