The generator matrix

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

generates a code of length 80 over Z8 who´s minimum homogenous weight is 74.

Homogenous weight enumerator: w(x)=1x^0+206x^74+346x^75+434x^76+338x^77+490x^78+342x^79+361x^80+234x^81+290x^82+212x^83+175x^84+146x^85+164x^86+102x^87+96x^88+26x^89+49x^90+38x^91+17x^92+4x^93+16x^94+4x^96+4x^97+1x^98

The gray image is a code over GF(2) with n=320, k=12 and d=148.
This code was found by Heurico 1.11 in 0.633 seconds.