The generator matrix

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

generates a code of length 80 over Z8 who´s minimum homogenous weight is 76.

Homogenous weight enumerator: w(x)=1x^0+257x^76+160x^78+307x^80+64x^82+160x^84+32x^86+24x^88+15x^92+2x^96+1x^104+1x^120

The gray image is a code over GF(2) with n=320, k=10 and d=152.
This code was found by Heurico 1.16 in 5.18 seconds.