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

generates a code of length 75 over Z8 who´s minimum homogenous weight is 70.

Homogenous weight enumerator: w(x)=1x^0+144x^70+115x^72+288x^74+232x^76+136x^78+33x^80+64x^82+8x^86+2x^88+1x^136

The gray image is a code over GF(2) with n=300, k=10 and d=140.
This code was found by Heurico 1.16 in 46.6 seconds.