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

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

Homogenous weight enumerator: w(x)=1x^0+39x^34+102x^35+128x^36+154x^37+265x^38+358x^39+372x^40+392x^41+451x^42+540x^43+407x^44+216x^45+220x^46+176x^47+92x^48+64x^49+42x^50+38x^51+21x^52+6x^53+6x^54+2x^55+3x^56+1x^62

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 0.565 seconds.