The generator matrix

 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  X  X  1  1  1  1  1  1  1  1  X  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  1  1  1  X  1  2  2  X
 0 2X+2  0  2  0  0  2 2X+2  0  0  2 2X+2  0  0  2 2X+2  0  0  2 2X+2  0  0  2 2X+2  0  0  0  0 2X 2X 2X+2  2  2 2X+2  2 2X+2  2 2X+2 2X 2X 2X 2X 2X 2X 2X+2 2X  2 2X 2X 2X+2  2 2X 2X 2X+2  2 2X 2X 2X+2  2 2X 2X 2X+2  2 2X 2X 2X+2  2  0  0  2 2X+2 2X 2X+2 2X  2  2  2 2X+2  2 2X+2  2
 0  0 2X+2  2  0 2X+2  2  0  0 2X+2  2  0  0 2X+2  2  0 2X  2 2X+2 2X 2X  2 2X+2 2X 2X  2 2X  2  2  2 2X+2 2X 2X+2 2X+2 2X+2 2X 2X 2X  2 2X  2 2X  2 2X 2X+2  2 2X 2X  2 2X+2 2X  0 2X+2  2  0  0 2X+2  2  0  0 2X+2  2  0  0 2X+2  2  0  0 2X+2  2  0 2X 2X+2  2 2X+2  2 2X+2  2 2X+2 2X  0
 0  0  0 2X  0  0 2X  0 2X 2X  0 2X 2X 2X  0 2X 2X 2X 2X 2X 2X 2X 2X 2X  0  0  0  0  0  0  0  0  0  0  0  0  0  0 2X  0  0  0  0 2X 2X 2X 2X 2X 2X 2X 2X 2X 2X 2X 2X 2X 2X 2X 2X  0  0  0  0  0  0  0  0  0  0  0  0 2X 2X 2X  0 2X 2X 2X  0  0 2X
 0  0  0  0 2X 2X 2X 2X 2X 2X  0 2X  0  0 2X  0  0  0  0  0 2X 2X 2X 2X 2X 2X  0  0  0 2X  0  0  0 2X 2X  0 2X 2X 2X  0  0 2X 2X 2X 2X 2X 2X  0  0  0  0  0  0  0  0 2X 2X 2X 2X 2X 2X 2X 2X  0  0  0  0  0  0  0 2X  0 2X  0 2X  0  0 2X  0 2X  0

generates a code of length 81 over Z4[X]/(X^2+2) who´s minimum homogenous weight is 78.

Homogenous weight enumerator: w(x)=1x^0+103x^78+64x^79+223x^80+256x^81+235x^82+64x^83+43x^84+29x^86+4x^88+1x^90+1x^148

The gray image is a code over GF(2) with n=648, k=10 and d=312.
This code was found by Heurico 1.16 in 77.6 seconds.