The generator matrix

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

generates a code of length 71 over Z8 who´s minimum homogenous weight is 64.

Homogenous weight enumerator: w(x)=1x^0+235x^64+442x^66+802x^68+582x^70+743x^72+614x^74+438x^76+126x^78+54x^80+24x^82+24x^84+4x^86+5x^88+2x^96

The gray image is a code over GF(2) with n=284, k=12 and d=128.
This code was found by Heurico 1.16 in 26.5 seconds.