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  7  1  7  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 35  1  1  1  1 21  1  1  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 26  1  4  0  1 31  1 38  7 36 26 21  9 46  6  6 43  3 46  9 46  0  6  9 31 36 38 26 22 37 20 42  1 24 40 25 41  1  7 28 33 39 38 20  4  2 48 10 11 42 24  6 48  0
 0  0 35  0 35  7 35  7 42 14  7 42  0  0 42 14 21 28 14 21 28  7  7 14 28 14  7 14 21 42 35 14 14  0 28 28  0 28 21 14  0 35 35 28  0 35  0 35 28  7  7  7 14 28 14  7 28 21  7 35  7 14 35 28  7 35  7 42 42 42 21  0  0  7
 0  0  0  7 28 28 21 42  0 42  7 42 35 28 21 21 42 21 35 35 35 21  0 35 28 28 35 21 42 35 14 42 14 14  0 35 28 14  7 21 35 42 21  0  0  7 14  0 42 42 21 35 28 21 28  7 28  0  0 28 14 14 21 14 42 14  7 42  7 14 35  7  0  7

generates a code of length 74 over Z49 who´s minimum homogenous weight is 420.

Homogenous weight enumerator: w(x)=1x^0+342x^420+42x^421+126x^423+336x^424+588x^426+2460x^427+1428x^428+2226x^430+2982x^431+2184x^433+4170x^434+2268x^435+4914x^437+5502x^438+3150x^440+8064x^441+3612x^442+11802x^444+11634x^445+5376x^447+10176x^448+4746x^449+9744x^451+8358x^452+3108x^454+5502x^455+2310x^456+156x^462+126x^469+66x^476+78x^483+12x^490+36x^497+6x^504+18x^511

The gray image is a code over GF(7) with n=518, k=6 and d=420.
This code was found by Heurico 1.16 in 6.89 seconds.