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

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

Homogenous weight enumerator: w(x)=1x^0+129x^68+214x^70+44x^71+236x^72+152x^73+248x^74+136x^75+234x^76+128x^77+190x^78+44x^79+102x^80+8x^81+72x^82+52x^84+40x^86+13x^88+4x^90+1x^124

The gray image is a code over GF(2) with n=300, k=11 and d=136.
This code was found by Heurico 1.16 in 0.451 seconds.