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

generates a code of length 70 over Z49 who´s minimum homogenous weight is 416.

Homogenous weight enumerator: w(x)=1x^0+630x^416+252x^419+618x^420+840x^423+42x^426+12x^441+6x^448

The gray image is a code over GF(7) with n=490, k=4 and d=416.
This code was found by Heurico 1.16 in 15.7 seconds.