The generator matrix

 1  0  1  1  1  1  1  1  1  1  1  1  1  1  1  7  1  1  1  1  1  1  1 21  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 14  1  1 42  1  1  1  1  1  1  1 28
 0  1 36 31 16 48  4 19  7 29 38  9  6 46 26  1 21 43  3 23 20 11 40  1 14 36 45 44 13 32 29 33 15 42 24  2 41 39 12 28 10 22 37 27 25 47 35 17 30  8 34 18  5  1  0  1 31 16  1  7 38  9 21 43  3 23  1

generates a code of length 67 over Z49 who´s minimum homogenous weight is 398.

Homogenous weight enumerator: w(x)=1x^0+504x^398+24x^399+252x^401+882x^402+672x^405+42x^408+18x^420+6x^427

The gray image is a code over GF(7) with n=469, k=4 and d=398.
This code was found by Heurico 1.16 in 1.56 seconds.