The generator matrix

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

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

Homogenous weight enumerator: w(x)=1x^0+58x^70+188x^71+324x^72+328x^73+420x^74+452x^75+382x^76+264x^77+228x^78+348x^79+260x^80+236x^81+154x^82+132x^83+119x^84+56x^85+44x^86+32x^87+29x^88+12x^89+20x^90+3x^92+2x^94+2x^96+2x^98

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 0.886 seconds.