The generator matrix

 1  0  0  1  1  1  6  4  1  1  1  1  2  6  1  1  1  4  2  6  1  1  6  1  1  1  0  4  1  2  6  6  1  1  1  1  0  1  1  1  1  4  1  4  0  1  1  1  0  6  0  1  1  6  1  1  1  1  6  2  1  4  0  1  6  1  2  1  1  1  0  2  4  6  1  2  1
 0  1  0  0  1  1  1  1  6  3  2  5  1  0  7  4  1  1  1  6  0  7  1  2  3  4  6  1  6  4  1  1  3  6  3  1  1  6  1  0  3  0  6  1  1  4  4  3  1  1  4  5  5  1  5  4  5  3  6  6  2  1  2  3  6  1  4  2  2  0  1  1  1  0  2  1  0
 0  0  1  3  3  0  3  7  3  0  4  5  2  1  1  2  6  2  1  1  5  2  0  7  7  4  1  1  1  1  0  7  6  6  7  7  2  4  0  5  4  1  3  5  3  2  3  3  3  3  1  1  0  1  3  3  5  5  1  1  4  3  1  0  1  0  1  5  7  3  5  1  6  1  6  5  0
 0  0  0  4  0  0  4  0  0  4  0  0  4  4  4  4  4  4  4  4  4  0  0  0  4  4  0  0  0  4  0  4  0  4  4  4  4  0  4  4  4  0  4  4  0  0  0  0  4  0  4  0  4  0  4  4  4  0  4  0  4  0  4  0  0  0  4  0  4  0  4  0  0  0  4  0  0
 0  0  0  0  4  0  0  0  0  0  0  0  0  0  0  4  4  4  4  4  4  4  4  4  4  0  4  4  0  0  4  4  0  4  0  4  0  4  0  4  4  0  0  0  0  0  4  0  0  4  4  4  4  0  0  4  0  0  0  4  4  4  4  0  0  0  4  4  0  0  4  0  4  4  0  4  4
 0  0  0  0  0  4  4  0  4  0  4  4  4  4  0  4  4  0  0  0  4  0  4  0  4  4  4  0  0  0  0  4  0  0  4  0  0  4  4  0  0  4  4  0  4  4  4  0  4  4  4  4  0  4  0  0  4  4  0  0  4  4  0  4  4  0  4  4  0  4  4  0  4  4  0  4  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+168x^71+258x^72+498x^73+366x^74+428x^75+297x^76+368x^77+281x^78+300x^79+212x^80+262x^81+136x^82+130x^83+104x^84+68x^85+44x^86+56x^87+19x^88+20x^89+10x^90+6x^91+2x^92+1x^94+2x^96+1x^100

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 0.842 seconds.