The generator matrix

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

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

Homogenous weight enumerator: w(x)=1x^0+176x^68+136x^69+340x^70+192x^71+437x^72+304x^73+394x^74+312x^75+441x^76+252x^77+318x^78+208x^79+204x^80+104x^81+136x^82+24x^83+48x^84+4x^85+20x^86+26x^88+6x^90+2x^92+2x^94+8x^96+1x^100

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 0.966 seconds.