The generator matrix

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

generates a code of length 64 over Z8 who´s minimum homogenous weight is 54.

Homogenous weight enumerator: w(x)=1x^0+177x^54+594x^55+1049x^56+1780x^57+2266x^58+3262x^59+3986x^60+4868x^61+5248x^62+6268x^63+6032x^64+6648x^65+5656x^66+4958x^67+4081x^68+3146x^69+2077x^70+1550x^71+890x^72+560x^73+184x^74+128x^75+85x^76+14x^77+6x^78+8x^79+4x^80+8x^81+2x^82

The gray image is a code over GF(2) with n=256, k=16 and d=108.
This code was found by Heurico 1.11 in 54.8 seconds.