Here is first a link to the Halloween card
https://en.wikisource.org/wiki/Zodiac_K … _27th_1970
You can read verticaly PARADICE and horizontal SLAVES and divided into four parts.
Every part is filled with BY GUN, BY FIRE etc.
The Cipher 340 seems to have the same pattern.
I attacked a file for better illustration. P=P, +=A, half moon=r, D=D,I=I,C=C,<=E it seems -=S
The lower part of the Cipher seems it has to be mirrored and the left part of the lower part has to be turn 90 degree. The second picture you can see it the by fits perfect to the Halloween card.
Maybe there is an additional hint from Zodiac.
https://en.wikisource.org/wiki/Zodiac_K … _27th_1969
Yes, this has been extensively covered before, and I agree it’s the answer to the 340 cipher.
https://www.zodiacciphers.com/
“I simply cannot accept that there are, on every story, two equal and logical sides to an argument.” Edward R. Murrow.