The generator matrix

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

generates a code of length 75 over Z8 who´s minimum homogenous weight is 68.

Homogenous weight enumerator: w(x)=1x^0+272x^68+444x^69+618x^70+668x^71+683x^72+588x^73+742x^74+616x^75+689x^76+564x^77+492x^78+472x^79+434x^80+296x^81+230x^82+120x^83+127x^84+56x^85+40x^86+12x^87+18x^88+4x^89+4x^90+2x^94

The gray image is a code over GF(2) with n=300, k=13 and d=136.
This code was found by Heurico 1.11 in 4.19 seconds.