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

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

Homogenous weight enumerator: w(x)=1x^0+144x^70+8x^71+197x^72+52x^73+208x^74+116x^75+289x^76+168x^77+240x^78+112x^79+171x^80+36x^81+80x^82+20x^83+101x^84+56x^86+34x^88+8x^90+6x^92+1x^128

The gray image is a code over GF(2) with n=308, k=11 and d=140.
This code was found by Heurico 1.16 in 3.18 seconds.