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

generates a code of length 78 over Z8 who´s minimum homogenous weight is 74.

Homogenous weight enumerator: w(x)=1x^0+240x^74+188x^76+258x^78+124x^80+144x^82+35x^84+20x^86+2x^88+8x^90+2x^94+1x^112+1x^116

The gray image is a code over GF(2) with n=312, k=10 and d=148.
This code was found by Heurico 1.16 in 33.3 seconds.