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

generates a code of length 78 over Z8 who´s minimum homogenous weight is 74.

Homogenous weight enumerator: w(x)=1x^0+19x^74+46x^75+54x^76+80x^77+115x^78+92x^79+39x^80+32x^81+25x^82+6x^83+2x^84+1x^150

The gray image is a code over GF(2) with n=312, k=9 and d=148.
This code was found by Heurico 1.16 in 0.169 seconds.