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

generates a code of length 76 over Z8 who´s minimum homogenous weight is 70.

Homogenous weight enumerator: w(x)=1x^0+88x^70+92x^72+200x^74+270x^76+224x^78+61x^80+60x^82+18x^84+5x^88+4x^90+1x^136

The gray image is a code over GF(2) with n=304, k=10 and d=140.
This code was found by Heurico 1.16 in 0.261 seconds.