The generator matrix

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

generates a code of length 80 over Z8 who´s minimum homogenous weight is 64.

Homogenous weight enumerator: w(x)=1x^0+100x^64+22x^66+293x^68+36x^69+314x^70+176x^71+1005x^72+468x^73+1320x^74+1064x^75+2430x^76+1928x^77+2954x^78+2496x^79+3660x^80+2440x^81+2944x^82+1904x^83+2452x^84+1108x^85+1342x^86+464x^87+894x^88+164x^89+288x^90+40x^91+287x^92+30x^94+91x^96+2x^98+38x^100+9x^104+3x^108+1x^116

The gray image is a code over GF(2) with n=320, k=15 and d=128.
This code was found by Heurico 1.16 in 58.3 seconds.