The generator matrix

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

generates a code of length 76 over Z8 who´s minimum homogenous weight is 70.

Homogenous weight enumerator: w(x)=1x^0+168x^70+336x^71+380x^72+510x^73+347x^74+422x^75+336x^76+332x^77+255x^78+176x^79+181x^80+164x^81+90x^82+142x^83+96x^84+52x^85+35x^86+28x^87+18x^88+14x^89+9x^90+4x^92

The gray image is a code over GF(2) with n=304, k=12 and d=140.
This code was found by Heurico 1.16 in 0.704 seconds.