The generator matrix

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

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

Homogenous weight enumerator: w(x)=1x^0+378x^74+725x^76+835x^78+755x^80+476x^82+371x^84+232x^86+154x^88+112x^90+39x^92+13x^94+2x^96+2x^98+1x^100

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 47.7 seconds.