The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  4  2  1  2  4  4  4  1  0  1  1  0  1  4  0  2  2  4  1  1  2  2  2  0  2  1  2  4  1  1  4  2  1  1  1  4  0  0  1  2  1
 0  2  0  0  0  0  0  0  0  2  2  6  6  6  0  2  6  0  4  6  6  4  6  2  4  0  2  6  6  2  6  4  2  2  0  4  2  4  0  4  4  6  4  0  0  2  4  0  2  2  2  4  4  6  2  0  2  4  2  0  0  2  0  4  2  6  0  2  4  2  0  2  0  0  2  2  4  0  2  2  2  4  2  6  0
 0  0  2  0  0  0  2  6  2  2  2  4  2  6  0  0  0  4  2  6  2  0  6  4  6  2  0  2  0  4  6  2  2  4  0  2  4  0  0  4  6  4  4  0  2  4  0  6  6  2  0  0  4  6  4  0  6  4  6  4  4  6  6  2  0  6  4  0  2  2  4  2  4  0  4  4  4  2  0  0  0  2  4  0  0
 0  0  0  2  0  2  2  6  0  0  2  2  0  2  0  4  6  6  2  0  6  6  0  4  0  6  0  6  4  4  4  2  6  6  0  4  2  6  0  2  2  4  2  6  6  2  6  4  6  0  4  6  4  6  6  2  6  2  6  4  6  6  2  0  2  0  0  4  0  4  0  4  6  0  4  2  6  0  6  6  4  4  0  2  0
 0  0  0  0  2  2  0  6  2  0  2  2  2  4  4  6  0  6  6  0  2  0  2  6  2  4  0  0  6  4  4  0  2  4  6  0  2  4  4  4  2  0  4  0  0  4  2  4  2  4  2  4  2  4  4  0  2  2  4  6  2  2  6  6  6  2  2  0  4  0  6  4  6  6  6  2  2  2  6  2  0  0  6  2  0
 0  0  0  0  0  4  0  0  0  4  4  0  4  4  4  4  4  4  0  0  0  4  0  4  4  4  0  4  0  4  0  0  0  0  4  0  0  0  4  4  4  4  0  4  4  4  4  0  0  0  0  0  0  0  0  4  4  0  0  0  4  4  0  4  0  4  4  0  4  0  0  0  0  0  0  0  4  0  4  4  0  4  0  0  0
 0  0  0  0  0  0  4  0  0  0  0  0  4  0  0  0  4  4  4  0  0  0  4  4  0  4  4  4  0  0  4  4  4  0  0  0  4  4  4  4  0  0  4  0  4  0  4  4  0  4  0  0  0  4  4  0  4  0  0  0  4  0  0  4  4  4  4  4  4  4  0  0  0  0  4  0  0  4  4  4  0  0  4  0  0
 0  0  0  0  0  0  0  4  0  4  0  4  0  0  4  4  4  4  0  0  4  0  4  0  0  0  0  0  4  0  0  4  4  4  0  0  4  4  4  0  4  0  0  0  4  4  0  4  0  4  0  0  4  4  0  0  4  4  0  0  0  4  0  0  0  4  4  0  4  4  0  4  4  4  4  0  4  0  0  4  4  4  4  0  0
 0  0  0  0  0  0  0  0  4  0  0  0  0  4  0  0  4  4  4  4  4  4  4  4  0  4  4  0  4  4  0  0  0  4  4  4  0  0  0  4  0  0  0  0  4  0  0  4  4  0  4  4  0  0  4  4  0  4  4  4  4  0  0  4  4  4  0  4  0  0  0  0  0  0  0  0  0  0  4  0  0  4  0  4  0

generates a code of length 85 over Z8 who´s minimum homogenous weight is 70.

Homogenous weight enumerator: w(x)=1x^0+38x^70+60x^71+199x^72+256x^73+348x^74+406x^75+605x^76+742x^77+925x^78+1076x^79+1431x^80+1752x^81+2183x^82+2470x^83+2559x^84+2778x^85+2497x^86+2522x^87+2051x^88+1886x^89+1432x^90+1138x^91+962x^92+586x^93+537x^94+408x^95+288x^96+148x^97+195x^98+98x^99+81x^100+38x^101+34x^102+14x^103+14x^104+6x^105+2x^106+1x^118+1x^124

The gray image is a code over GF(2) with n=340, k=15 and d=140.
This code was found by Heurico 1.16 in 88.4 seconds.