Which hoses am I supposed to suck the seafoam through to get it into the intake manifold?

 

You can't see them in that pic. Behind/beneath that solenoid panel there are two hoses that come up and turn forward, plugging into the suction pump, which is a black plastic Y shaped pipe about 4" long and 3/4" in diameter. You want to use one of those.

 

thanks a lot man, i'm gonna go try to find it. Wish me luck

 

These:

Or,

Since I'm having such a hard time finding the right line, I think I'm gonna just put it in the gas tank and in my oil.

 

The one in that second pic is the one I used; just unscrew that clamp, move it to a position you can get the cup of seafoam on it, and let r suck away! I had to use a straw to extend the hose a little bit, made things a lot easier, but the point of the matter is that's the one to use.