The generator matrix

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

generates a code of length 76 over Z8 who´s minimum homogenous weight is 69.

Homogenous weight enumerator: w(x)=1x^0+332x^69+338x^70+688x^71+505x^72+904x^73+518x^74+810x^75+518x^76+760x^77+461x^78+626x^79+361x^80+490x^81+208x^82+296x^83+66x^84+148x^85+72x^86+42x^87+21x^88+18x^89+2x^90+2x^91+4x^93+1x^94

The gray image is a code over GF(2) with n=304, k=13 and d=138.
This code was found by Heurico 1.16 in 36.3 seconds.