The generator matrix

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

generates a code of length 74 over Z8 who´s minimum homogenous weight is 68.

Homogenous weight enumerator: w(x)=1x^0+206x^68+306x^69+394x^70+408x^71+459x^72+334x^73+399x^74+224x^75+325x^76+192x^77+227x^78+162x^79+112x^80+86x^81+125x^82+40x^83+49x^84+10x^85+7x^86+26x^87+4x^91

The gray image is a code over GF(2) with n=296, k=12 and d=136.
This code was found by Heurico 1.16 in 0.674 seconds.