The generator matrix

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

generates a code of length 92 over GR(64,4) who´s minimum homogenous weight is 624.

Homogenous weight enumerator: w(x)=1x^0+2331x^624+3808x^625+1176x^626+560x^627+784x^628+2520x^629+1960x^630+3920x^631+17759x^632+12656x^633+3864x^634+4032x^635+2632x^636+8848x^637+4256x^638+5768x^639+24255x^640+15512x^641+5264x^642+5936x^643+3136x^644+7000x^645+3528x^646+6272x^647+24178x^648+14784x^649+4536x^650+7392x^651+4200x^652+10304x^653+4592x^654+5544x^655+21476x^656+14168x^657+3080x^658+56x^664+21x^672+35x^680

The gray image is a code over GF(8) with n=736, k=6 and d=624.
This code was found by Heurico 1.16 in 19 seconds.