Carlos,
I did a couple things to keep the wiper (cleaner) from hitting the hood.
Your wiper motor looks like an electric motor which is an acceptable replacement, but is not original on a CJ3A.
In this photo, you see the original style vacuum wiper motor.� You also can see that I added spacers.� This shortened the wiper arm on the other side of the windshield�

I also made the decision to make my hood blocks taller than the originals.� My blocks are about 2 3/8�� (6 cm) tall.� This gave me a little more space between the wiper (cleaner) and the hood.
I don�t have a close up of my wiper arms, but in these photos you can see that I have almost no wiper arm shaft on the outside of the windshield.


Hopefully this helps a little
Tim