The generator matrix

 1  0  1  1  1  6  1  1  4  1  1  6  0  2  1  1  1  1  1  1  6  1  1  0  1  1  0  1  6  1  1  1  4  1  2  1  1  1  1  1  0  1  1  1  6  1  0  6  4  2  4  6  0  0  6  6  0  4  4  4  6  0  6  2  2  2  0  1  1  2  1  1  2  1  1  2  1  1
 0  1  1  6  3  1  5  4  1  2  7  1  1  1  0  3  6  5  0  3  1  6  5  1  0  3  1  6  1  7  7  0  1  2  1  3  5  4  2  1  1  4  7  2  1  7  1  1  1  1  1  1  2  1  1  1  1  1  1  1  1  1  1  1  1  2  2  4  0  6  1  5  4  7  2  4  6  7
 0  0  2  0  0  4  0  6  2  6  2  4  6  2  4  4  6  2  6  2  6  4  4  0  0  0  0  4  4  4  2  6  6  6  6  2  0  4  0  4  2  2  6  2  2  6  4  0  4  4  2  2  4  6  6  0  0  0  4  6  2  2  6  0  4  0  2  6  2  4  2  6  0  4  4  2  0  4
 0  0  0  4  0  4  4  4  4  0  4  0  0  0  0  4  0  4  4  0  4  4  0  4  4  0  0  0  4  4  0  4  0  0  4  4  4  4  0  0  4  0  4  4  0  0  0  4  4  0  0  0  4  4  4  0  4  4  0  0  4  4  0  4  0  4  0  0  0  0  0  4  0  0  0  4  0  4
 0  0  0  0  4  4  4  4  0  4  0  4  0  4  4  0  0  4  0  4  4  4  0  0  4  0  4  0  0  4  4  4  0  0  4  0  0  0  4  4  0  4  4  0  4  0  0  4  4  0  4  0  0  4  0  0  4  0  4  4  0  4  0  0  4  4  4  0  0  4  4  0  4  0  0  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+199x^74+289x^76+189x^78+168x^80+87x^82+49x^84+31x^86+1x^88+2x^90+2x^92+2x^104+4x^106

The gray image is a code over GF(2) with n=312, k=10 and d=148.
This code was found by Heurico 1.16 in 14.5 seconds.