The generator matrix

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

generates a code of length 22 over GR(64,4) who´s minimum homogenous weight is 140.

Homogenous weight enumerator: w(x)=1x^0+336x^140+5208x^141+7392x^142+154x^144+2240x^147+4704x^148+31248x^149+24640x^150+217x^152+32256x^154+15680x^155+16464x^156+74648x^157+46816x^158+42x^160+35x^168+63x^176

The gray image is a code over GF(8) with n=176, k=6 and d=140.
This code was found by Heurico 1.16 in 3.16 seconds.