The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  2  1  1  0  0  2  1  2  0  2  1  4  4  2  1  4  1  1  1  1  2  1
 0  2  0  2  0  0  2  6  0  4  6  2  0  2  2  4  4  0  6  0  6  4  0  2  2  6  0  0  0  4  4  2  2  6  2  2  2  2  2  4  6  4
 0  0  2  2  0  6  2  0  4  2  0  2  0  6  4  2  2  2  4  0  0  2  6  0  4  0  4  6  2  2  2  2  2  4  6  2  4  0  6  0  0  2
 0  0  0  4  0  0  0  0  4  4  4  4  4  0  4  0  0  0  4  4  0  0  0  0  4  0  0  0  4  0  4  4  0  4  0  0  4  4  0  0  4  0
 0  0  0  0  4  0  0  0  0  0  0  4  4  4  0  0  0  0  0  0  0  4  4  4  4  0  4  4  4  0  4  4  4  0  0  0  4  4  4  4  0  4
 0  0  0  0  0  4  0  0  0  4  0  0  4  4  4  4  4  0  0  4  4  0  4  4  0  0  0  4  4  0  4  4  0  4  4  0  0  0  0  0  4  0
 0  0  0  0  0  0  4  0  4  4  4  4  4  0  4  4  4  4  0  0  4  0  0  4  4  4  4  4  0  0  0  4  4  0  4  4  0  0  4  4  0  4
 0  0  0  0  0  0  0  4  0  0  0  4  0  4  4  0  4  4  4  0  4  4  4  0  0  0  0  4  0  0  4  0  4  4  0  4  4  0  0  4  4  0

generates a code of length 42 over Z8 who´s minimum homogenous weight is 34.

Homogenous weight enumerator: w(x)=1x^0+71x^34+4x^35+234x^36+60x^37+384x^38+180x^39+556x^40+268x^41+659x^42+268x^43+517x^44+180x^45+328x^46+60x^47+193x^48+4x^49+85x^50+32x^52+8x^54+2x^56+1x^58+1x^60

The gray image is a code over GF(2) with n=168, k=12 and d=68.
This code was found by Heurico 1.16 in 0.597 seconds.