The generator matrix

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

generates a code of length 80 over Z2[X]/(X^2) who´s minimum homogenous weight is 78.

Homogenous weight enumerator: w(x)=1x^0+152x^78+57x^80+32x^86+3x^88+8x^94+2x^96+1x^104

The gray image is a linear code over GF(2) with n=160, k=8 and d=78.
As d=78 is an upper bound for linear (160,8,2)-codes, this code is optimal over Z2[X]/(X^2) for dimension 8.
This code was found by Heurico 1.16 in 27.6 seconds.