The generator matrix

 1  0  1  1  1  1  1  1  1  1  1  1  1  1  1  0  1  1  1  1  1  0  1  1  1  1  1  1  1  1  7  1  1  1  1  1  1  7  1  1  1  1  1  0  1 42  1  1  1  1  1  1  1  1  1  1  1  1  1  1
 0  1  1 31 16 48  4 19  0 36 31 16 48  4 19  1 19 16 48 36  4  1  0 31 38 36  7 26  6 14  1  9 26  3  9 43 20  1 30 21 48  2 34  1 20  1 43 13 35 44  5 16  5 44 27 46 47 11 28  0
 0  0 35  0 35  7 35  7 42 14  7 42  0  0 42 14 21 28 14 21 42 14 21  7 35 21 21 42 21 35 35  7 21 35  7  0  0 14 35  0 28 14  0  7  7  7  7 42 21 42 28  7 21 42 42 35 21 42  7  0
 0  0  0  7 28 28 21 42  0 42  7 42 35 28 21 21 42 21 35 35 14  0 42  0 35 21  7 35 28  7  7 21 14 28 14  0  7 14 14 14 14 28 42 28  0  0  7 14 21  0 35 42 28 35 28 14 35 42 21  7

generates a code of length 60 over Z49 who´s minimum homogenous weight is 336.

Homogenous weight enumerator: w(x)=1x^0+114x^336+42x^339+126x^340+336x^341+1218x^342+474x^343+840x^344+756x^345+1176x^346+1554x^347+1890x^348+4410x^349+510x^350+3360x^351+2142x^352+2394x^353+2814x^354+2898x^355+5922x^356+360x^357+11340x^358+5796x^359+5922x^360+5670x^361+5712x^362+11214x^363+240x^364+13272x^365+5712x^366+4872x^367+4242x^368+3570x^369+6048x^370+216x^371+150x^378+102x^385+114x^392+66x^399+48x^406+6x^413

The gray image is a code over GF(7) with n=420, k=6 and d=336.
This code was found by Heurico 1.16 in 5.47 seconds.