The generator matrix

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

generates a code of length 77 over Z8 who´s minimum homogenous weight is 70.

Homogenous weight enumerator: w(x)=1x^0+284x^70+412x^71+661x^72+608x^73+788x^74+596x^75+760x^76+572x^77+598x^78+540x^79+640x^80+364x^81+394x^82+268x^83+287x^84+164x^85+122x^86+40x^87+44x^88+20x^89+18x^90+5x^92+4x^94+2x^96

The gray image is a code over GF(2) with n=308, k=13 and d=140.
This code was found by Heurico 1.11 in 7.19 seconds.