as you can see i am very bored at work and found a Water neck spacer online that has 2-3/8 ports on it and im wondering how would this benefit me?....can i put this on and run lines to my rear water crossover? or is it for something else?

Yup, that's what it's used for ;)

hahaha so this would help cool the rear of my engine?

after talking to a few that i respect i came to the conclusion that it wasn't going to "Really" make a difference on my set up so it's now sitting on a shelf in my shop...