The generator matrix

 1  0  0  1  1  1  4  1  4  1  4  4  1  1  6  4  1  1  1  1  2  4  1  1  6  1  2  1  2  1  1  1  0  1  1  1  1  2  6  2  1  1  1  6  0  0  4  6  1  1  1  1  1  6  1  1  6  1  0  0  1  1  1  6  1  1  2  2  6  2  2  2  1  6  1
 0  1  0  0  1  3  1  4  4  0  1  1  5  3  6  1  0  1  2  7  1  6  7  2  1  1  1  4  1  7  5  2  1  2  4  1  6  1  1  1  4  7  0  1  1  6  1  4  6  3  1  6  0  1  5  0  1  2  1  1  5  3  0  1  3  0  6  1  1  6  6  2  6  1  0
 0  0  1  1  3  4  3  7  1  6  2  1  1  2  1  0  2  0  1  1  3  1  4  2  4  1  6  3  5  7  6  3  3  6  1  5  6  0  4  3  2  6  7  6  3  1  2  1  0  0  7  7  0  7  5  7  2  1  5  2  6  4  4  1  2  1  1  4  6  1  1  1  5  2  0
 0  0  0  2  2  0  6  6  6  4  0  6  6  4  6  2  2  6  4  0  4  4  6  2  0  0  6  4  0  6  0  6  2  6  4  2  4  6  4  0  0  2  4  2  0  4  0  2  2  0  0  2  4  2  0  2  0  2  4  6  4  2  6  6  2  2  2  2  6  0  2  4  6  6  0
 0  0  0  0  4  0  4  4  4  4  4  0  0  4  0  0  4  0  0  0  0  4  4  0  4  4  4  4  4  0  0  4  0  0  4  4  4  4  0  0  0  0  0  0  4  0  0  4  4  4  0  0  4  4  0  0  4  4  0  4  4  0  4  0  4  4  4  0  0  0  0  0  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+31x^68+252x^69+145x^70+576x^71+204x^72+584x^73+188x^74+560x^75+157x^76+412x^77+129x^78+316x^79+69x^80+184x^81+36x^82+104x^83+39x^84+32x^85+9x^86+44x^87+10x^88+8x^89+4x^90+1x^92+1x^94

The gray image is a code over GF(2) with n=300, k=12 and d=136.
This code was found by Heurico 1.16 in 0.849 seconds.