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  1  1  1  1  1  1  1  1  2  2  2  2  2  2  2  2  2  2  1  2  4  1  2  1  1  1  1  4  1  2  1  4  1  1  1  1  2  2  1  1
 0  4  0  0  0  0  0  0  0  0  0  0  0  0  4  0  0  0  0  0  0  0  0  0  4  4  4  4  4  4  4  0  4  4  4  4  0  4  0  0  0  4  4  4  0  4  4  4  0  4  0  4  0  4  0  4  0  0  4  4  0  0  0  0  0  4  4  0  0  0  4  0  0  4  0  4  4  4  0  0
 0  0  4  0  0  0  0  0  0  0  0  0  0  0  4  0  0  0  0  4  4  4  4  4  4  4  0  0  0  4  0  0  0  4  4  4  0  0  0  4  4  4  4  0  4  0  0  4  4  4  0  0  4  0  4  4  4  0  0  0  4  4  0  4  4  4  0  4  4  4  4  4  0  4  0  4  4  4  0  0
 0  0  0  4  0  0  0  0  0  0  0  0  0  4  0  0  0  4  4  4  4  4  4  0  0  0  0  4  0  4  4  4  0  4  0  0  4  4  0  0  0  4  4  4  0  4  0  4  4  4  4  4  0  0  0  0  0  4  0  4  0  0  4  4  0  4  0  0  0  0  4  4  0  4  4  4  4  0  0  0
 0  0  0  0  4  0  0  0  0  0  0  0  0  4  0  4  4  4  4  4  4  0  4  4  0  4  4  4  0  0  0  4  4  4  4  4  0  4  4  0  0  0  0  4  0  0  0  4  0  0  0  0  0  4  4  4  4  4  0  0  4  4  0  4  4  0  0  4  0  4  0  4  4  0  4  0  4  0  0  0
 0  0  0  0  0  4  0  0  0  0  0  0  4  0  0  4  4  0  4  4  0  4  0  4  0  4  4  4  4  0  0  4  4  0  0  0  4  0  4  0  0  0  4  0  4  0  4  4  4  4  0  0  4  0  0  4  0  0  4  0  4  0  4  4  4  0  4  4  4  0  4  4  4  0  4  4  4  4  0  0
 0  0  0  0  0  0  4  0  0  0  0  0  4  0  0  0  4  4  4  4  0  4  4  0  4  0  4  0  0  4  0  0  4  4  4  0  0  0  0  4  0  0  4  0  4  4  4  0  4  0  0  4  0  0  0  4  4  4  0  4  0  0  4  0  4  4  4  4  4  0  0  4  0  0  0  4  0  0  4  0
 0  0  0  0  0  0  0  4  0  0  0  4  0  0  0  0  4  4  0  4  0  0  0  4  4  4  0  0  4  0  4  4  4  4  0  0  0  4  4  4  4  4  0  0  0  0  4  4  4  4  0  4  4  4  0  0  4  0  0  4  0  4  4  0  4  0  0  4  4  4  4  0  4  0  0  4  0  0  4  0
 0  0  0  0  0  0  0  0  4  0  0  4  0  0  0  4  0  0  4  0  4  0  0  4  0  0  0  0  4  4  4  0  0  4  4  0  4  4  4  4  0  0  4  0  4  4  4  0  4  4  4  4  0  4  0  0  0  4  4  4  0  4  4  0  4  0  4  0  0  4  0  4  0  4  0  0  4  0  0  0
 0  0  0  0  0  0  0  0  0  4  0  4  4  4  4  4  0  0  0  4  0  0  4  4  0  0  4  0  4  4  0  0  4  4  0  4  4  0  0  0  0  4  0  0  0  4  0  4  0  4  4  0  4  0  4  4  4  4  0  4  0  4  0  4  0  4  0  4  0  0  0  4  4  4  4  0  0  4  0  0
 0  0  0  0  0  0  0  0  0  0  4  4  4  4  4  0  0  4  4  4  4  4  0  4  0  4  0  0  0  0  0  4  0  4  0  0  4  0  4  4  0  0  4  0  0  0  4  0  0  0  0  4  4  4  4  4  4  4  0  4  4  4  0  0  0  4  0  0  4  0  0  4  0  4  4  4  0  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+21x^64+90x^66+118x^68+148x^70+242x^72+342x^74+424x^76+512x^77+457x^78+1536x^79+496x^80+1536x^81+477x^82+512x^83+394x^84+290x^86+191x^88+136x^90+84x^92+77x^94+56x^96+27x^98+18x^100+4x^102+1x^104+1x^108+1x^124

The gray image is a code over GF(2) with n=320, k=13 and d=128.
This code was found by Heurico 1.16 in 7.87 seconds.