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

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

Homogenous weight enumerator: w(x)=1x^0+180x^70+128x^71+387x^72+224x^73+396x^74+312x^75+390x^76+248x^77+380x^78+276x^79+365x^80+224x^81+226x^82+80x^83+92x^84+40x^85+82x^86+4x^87+30x^88+6x^90+6x^92+6x^94+8x^96+4x^98+1x^104

The gray image is a code over GF(2) with n=308, k=12 and d=140.
This code was found by Heurico 1.16 in 1.29 seconds.