The generator matrix

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

generates a code of length 86 over Z8 who´s minimum homogenous weight is 74.

Homogenous weight enumerator: w(x)=1x^0+72x^74+116x^75+325x^76+442x^77+708x^78+962x^79+1282x^80+1670x^81+1996x^82+2300x^83+2505x^84+2752x^85+2604x^86+2690x^87+2595x^88+2338x^89+2050x^90+1666x^91+1212x^92+854x^93+633x^94+402x^95+207x^96+118x^97+97x^98+44x^99+49x^100+16x^101+18x^102+10x^103+11x^104+2x^105+8x^106+2x^107+5x^108+5x^110+1x^114

The gray image is a code over GF(2) with n=344, k=15 and d=148.
This code was found by Heurico 1.16 in 53.5 seconds.