The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  X  X  1  1  X  X  1  1  X  X  1  1  X  X  X  X  X  X  X  X  1  1  1  1  1  1  1  1  X  X  1  1  1  1  1  1  1  1 X^2  1
 0 X^3+X^2  0 X^3+X^2  0 X^3+X^2  0 X^3+X^2 X^3 X^2 X^3 X^2 X^3 X^2 X^3 X^2  0 X^3+X^2 X^3+X^2 X^3+X^2  0 X^3+X^2 X^3+X^2 X^3+X^2  0  0 X^3 X^3 X^2 X^2  0 X^3 X^2 X^2 X^2 X^2  0  0 X^3 X^3+X^2 X^3 X^3+X^2 X^3 X^2 X^3 X^2  0 X^3  0 X^3+X^2  0 X^3+X^2  0 X^3 X^3+X^2 X^2 X^3  0
 0  0 X^3  0  0 X^3 X^3 X^3 X^3 X^3 X^3 X^3  0  0  0  0  0  0  0 X^3 X^3 X^3  0 X^3  0 X^3 X^3  0 X^3  0 X^3 X^3 X^3 X^3  0  0  0 X^3 X^3  0 X^3 X^3  0 X^3  0  0  0  0  0  0  0 X^3 X^3 X^3  0 X^3  0  0
 0  0  0 X^3 X^3 X^3 X^3  0  0  0 X^3 X^3 X^3 X^3  0  0  0  0 X^3 X^3  0  0  0  0 X^3 X^3 X^3 X^3 X^3 X^3  0  0  0 X^3 X^3  0 X^3 X^3  0 X^3 X^3 X^3 X^3  0  0  0  0  0  0  0 X^3 X^3 X^3  0 X^3  0  0  0

generates a code of length 58 over Z2[X]/(X^4) who´s minimum homogenous weight is 56.

Homogenous weight enumerator: w(x)=1x^0+13x^56+54x^57+137x^58+32x^59+2x^60+8x^61+6x^62+2x^73+1x^82

The gray image is a linear code over GF(2) with n=464, k=8 and d=224.
This code was found by Heurico 1.16 in 0.156 seconds.