The generator matrix

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

generates a code of length 84 over Z8 who´s minimum homogenous weight is 78.

Homogenous weight enumerator: w(x)=1x^0+242x^78+288x^79+435x^80+440x^81+454x^82+312x^83+354x^84+256x^85+250x^86+196x^87+208x^88+124x^89+180x^90+76x^91+90x^92+48x^93+48x^94+20x^95+12x^96+28x^97+26x^98+4x^99+4x^100

The gray image is a code over GF(2) with n=336, k=12 and d=156.
This code was found by Heurico 1.16 in 0.928 seconds.