The generator matrix

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

generates a code of length 75 over Z8 who´s minimum homogenous weight is 68.

Homogenous weight enumerator: w(x)=1x^0+48x^68+184x^69+281x^70+372x^71+425x^72+384x^73+432x^74+378x^75+262x^76+278x^77+231x^78+182x^79+163x^80+122x^81+115x^82+86x^83+50x^84+50x^85+24x^86+6x^87+7x^88+6x^89+5x^90+4x^92

The gray image is a code over GF(2) with n=300, k=12 and d=136.
This code was found by Heurico 1.16 in 0.806 seconds.