The generator matrix

 1  0  0  1  1  1  2  6  1  1  1  1  2  4  6  1  1  1  4  6  1  1  0  2  1  1  2  1  4  1  6  1  0  1  4  2  1  1  6  4  1  1  0  1  6  1  0  1  1  1  4  2  0  1  1  1  1  1  4  2  4  6  1  2  1  2  1  1  1  0  1  4  1  0  2  4  0  6
 0  1  0  4  5  1  1  1  6  3  0  1  1  2  1  2  7  4  1  0  3  1  1  6  5  6  1  6  1  4  1  0  1  2  1  2  3  7  1  0  2  7  1  5  1  3  6  5  2  6  1  1  1  2  4  0  6  0  1  1  1  1  7  1  1  4  6  2  4  0  4  1  0  1  1  4  1  1
 0  0  1  7  3  4  3  2  7  3  2  6  5  1  0  0  4  5  5  1  5  1  3  1  4  6  0  0  6  3  6  6  7  1  0  1  2  7  5  1  2  5  2  2  7  6  1  7  3  1  2  4  6  5  1  1  3  7  4  2  7  3  0  1  5  1  4  6  6  2  0  1  4  1  6  2  6  6

generates a code of length 78 over Z8 who´s minimum homogenous weight is 76.

Homogenous weight enumerator: w(x)=1x^0+252x^76+96x^78+115x^80+40x^84+3x^88+4x^92+1x^104

The gray image is a code over GF(2) with n=312, k=9 and d=152.
This code was found by Heurico 1.16 in 98.3 seconds.