The generator matrix

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

generates a code of length 76 over Z8 who´s minimum homogenous weight is 68.

Homogenous weight enumerator: w(x)=1x^0+71x^68+256x^69+381x^70+582x^71+622x^72+770x^73+697x^74+706x^75+588x^76+670x^77+583x^78+538x^79+363x^80+402x^81+272x^82+282x^83+108x^84+98x^85+101x^86+32x^87+36x^88+12x^89+13x^90+4x^91+3x^92+1x^102

The gray image is a code over GF(2) with n=304, k=13 and d=136.
This code was found by Heurico 1.11 in 1.62 seconds.