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  2  0  2  0  2  0  2  0  2  0  2  0  2  0  2  0  2  4  2  4  2  4  2  4  2  4  2  4  2  2  4  4
 0  2  0  6  0  6  0  2  0  6  0  2  0  6  0  2  4  6  4  2  4  6  4  2  4  6  4  2  4  6  4  2  6  2  6  2  6  2  6  2  6  2  6  2  6  2  6  2  2  2  2  2  2  2  2  2  2  2  2  2  2  2  2  2
 0  0  4  0  0  0  4  0  0  4  0  4  4  4  4  4  4  0  4  0  4  0  4  0  0  4  0  4  0  4  0  4  0  0  0  0  4  4  4  4  0  0  0  0  4  4  4  4  4  4  4  4  0  0  0  0  4  4  0  4  4  0  0  0
 0  0  0  4  0  0  0  4  4  4  4  4  4  0  4  0  0  0  0  0  4  4  4  4  4  4  4  4  0  0  0  0  0  0  4  4  4  4  0  0  0  0  4  4  4  4  0  0  0  0  4  4  4  0  4  0  0  0  0  4  4  0  4  4
 0  0  0  0  4  4  4  4  4  0  0  4  0  4  4  0  0  0  4  4  4  4  0  0  0  4  4  0  4  0  0  4  0  4  4  0  0  4  4  0  4  0  0  4  4  0  0  4  0  4  4  0  0  4  4  0  4  0  4  4  0  0  0  4

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

Homogenous weight enumerator: w(x)=1x^0+253x^64+2x^96

The gray image is a code over GF(2) with n=256, k=8 and d=128.
This code was found by Heurico 1.16 in 2.3 seconds.