The generator matrix

 1  0  1  1  1  1  1  1
 0  1 2a^2+3  a 3a^2+2 2a^2+3a+1 a^2+3a a^2+3a+3

generates a code of length 8 over GR(64,4) who´s minimum homogenous weight is 49.

Homogenous weight enumerator: w(x)=1x^0+448x^49+504x^56+3136x^57+7x^64

The gray image is a code over GF(8) with n=64, k=4 and d=49.
This code was found by Heurico 1.16 in 0.000321 seconds.