The generator matrix

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

generates a code of length 78 over Z8 who´s minimum homogenous weight is 70.

Homogenous weight enumerator: w(x)=1x^0+98x^70+304x^71+382x^72+434x^73+760x^74+576x^75+835x^76+550x^77+733x^78+598x^79+693x^80+456x^81+513x^82+292x^83+321x^84+204x^85+173x^86+104x^87+65x^88+46x^89+21x^90+12x^91+4x^92+6x^93+4x^94+2x^95+3x^96+2x^98

The gray image is a code over GF(2) with n=312, k=13 and d=140.
This code was found by Heurico 1.16 in 2.94 seconds.