The generator matrix

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

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

Homogenous weight enumerator: w(x)=1x^0+386x^74+731x^76+862x^78+636x^80+556x^82+343x^84+290x^86+127x^88+102x^90+46x^92+12x^94+4x^96

The gray image is a code over GF(2) with n=320, k=12 and d=148.
This code was found by Heurico 1.16 in 29.6 seconds.