The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  2  2  1  1  1  1  1  2  4  1  0  1  1  0  1  1  1  2  1  1  1  4  1  1  1  2  2  1  1  0  1  1  1  1  1  1  2  1  2  1  1  1  1  1  1
 0  2  0  0  0  0  0  0  0  2  6  2  2  6  2  2  4  0  4  6  6  2  2  4  2  4  0  6  4  6  2  4  4  4  4  4  0  4  4  2  0  6  2  4  2  2  0  2  0  0  6  0  0  6  4  2  0  0  6  2  2  6  2  2  4  0  6  2  6  4  6  6  4  2  2  0  2  4  6
 0  0  2  0  0  0  2  6  2  2  2  4  2  2  0  4  4  6  0  0  2  0  4  0  6  6  0  6  2  4  2  6  6  4  0  6  4  4  2  4  0  0  2  6  0  4  0  6  4  6  4  4  2  2  6  0  0  6  2  6  4  4  0  0  4  6  0  0  2  6  6  6  6  6  2  2  0  2  2
 0  0  0  2  0  2  2  2  4  4  0  0  2  6  6  2  4  6  2  2  6  0  6  2  0  4  0  2  4  4  0  6  6  0  6  2  2  2  2  4  2  6  2  4  6  6  6  2  4  4  0  0  0  6  2  2  6  0  2  2  4  2  6  0  0  2  6  6  4  6  4  0  4  4  0  2  0  2  2
 0  0  0  0  2  2  4  6  2  4  2  2  6  4  4  6  0  2  2  4  0  6  6  4  4  6  2  6  4  4  6  4  6  6  6  0  4  2  4  2  4  6  2  6  4  2  6  4  0  4  6  2  4  2  4  4  0  0  4  6  4  0  0  2  0  4  2  4  4  4  6  2  6  2  6  2  2  6  0
 0  0  0  0  0  4  4  4  0  0  4  4  4  4  0  0  4  0  0  4  0  0  4  4  4  4  4  0  4  4  0  0  0  0  4  4  0  4  0  4  4  0  0  0  0  4  0  4  0  0  0  4  4  0  0  0  4  0  4  4  0  0  0  4  4  0  0  4  4  4  4  4  4  0  4  0  4  4  0

generates a code of length 79 over Z8 who´s minimum homogenous weight is 70.

Homogenous weight enumerator: w(x)=1x^0+100x^70+255x^72+32x^73+298x^74+108x^75+446x^76+240x^77+510x^78+300x^79+547x^80+192x^81+360x^82+100x^83+199x^84+48x^85+116x^86+4x^87+111x^88+66x^90+34x^92+18x^94+6x^96+4x^98+1x^132

The gray image is a code over GF(2) with n=316, k=12 and d=140.
This code was found by Heurico 1.16 in 1.46 seconds.