The generator matrix

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

generates a code of length 76 over Z8 who´s minimum homogenous weight is 70.

Homogenous weight enumerator: w(x)=1x^0+351x^70+741x^72+837x^74+714x^76+542x^78+357x^80+272x^82+142x^84+89x^86+29x^88+19x^90+2x^94

The gray image is a code over GF(2) with n=304, k=12 and d=140.
This code was found by Heurico 1.16 in 13.4 seconds.