Coolant crossover help

[Timberline]

I am a first time LS3 guy. Yep a virgin to LS3 but I am slut to all other old school motors of all makes. LOL

Can you show me where you have tied the coolant crossover line to?

Since I am old school I was planning on a coolant catch can for the radiator and tying the crossover to the catch can.

Upon filling the radiator (I had not tied the crossover line in yet) and while filling coolant it started running onto the floor. This make s me reconsider what I am doing and need your help with pictures would really be helpful.