The generator matrix

 1  0  0  0  1  1  1  0  1  1  1  1  0  0  1  1  1  1  1  1  1  1  0  0  0  X  X  X  X  0  X  0  0  X  X  0  X  1  X  1  1  1  X
 0  1  0  0  X  1 X+1  1  0  1  X X+1  1  X  X  1  X  1  0  0 X+1 X+1  1  1  1  1  1  1  1  1  1  1  1  1  1  0  1  X  1  0  X  0  0
 0  0  1  0  0  0  0  X  1  1  1  1  1  1  X X+1 X+1  X  X X+1 X+1  X X+1 X+1  1  X  0  1  X  0 X+1  X  1  0  X  1  0 X+1  1  0 X+1  X  1
 0  0  0  1  1 X+1  X X+1 X+1  0  X  1  1 X+1  0  1 X+1  X  1  X  0 X+1  0  X  X  0  1 X+1  X  1 X+1  0 X+1 X+1  1  1  X  0  1  X  X  X  1

generates a code of length 43 over Z2[X]/(X^2) who´s minimum homogenous weight is 40.

Homogenous weight enumerator: w(x)=1x^0+94x^40+48x^42+65x^44+16x^46+17x^48+6x^52+8x^56+1x^60

The gray image is a linear code over GF(2) with n=86, k=8 and d=40.
As d=40 is an upper bound for linear (86,8,2)-codes, this code is optimal over Z2[X]/(X^2) for dimension 8.
This code was found by Heurico 1.16 in 0.0283 seconds.