The generator matrix

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

generates a code of length 69 over Z8 who´s minimum homogenous weight is 64.

Homogenous weight enumerator: w(x)=1x^0+142x^64+204x^65+251x^66+280x^67+196x^68+230x^69+166x^70+120x^71+104x^72+92x^73+63x^74+40x^75+40x^76+30x^77+24x^78+24x^79+26x^80+4x^81+8x^82+2x^84+1x^88

The gray image is a code over GF(2) with n=276, k=11 and d=128.
This code was found by Heurico 1.16 in 0.246 seconds.