The generator matrix

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

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

Homogenous weight enumerator: w(x)=1x^0+128x^71+144x^72+224x^73+60x^74+320x^75+107x^76+272x^77+48x^78+232x^79+60x^80+224x^81+12x^82+80x^83+38x^84+48x^85+8x^86+8x^87+18x^88+14x^92+1x^96+1x^108

The gray image is a code over GF(2) with n=308, k=11 and d=142.
This code was found by Heurico 1.16 in 0.66 seconds.