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

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

Homogenous weight enumerator: w(x)=1x^0+148x^70+102x^72+306x^74+208x^76+174x^78+8x^80+62x^82+14x^86+1x^144

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 67.4 seconds.