Congratulations! 3.5hrs is not so far away

I make that trip from camp to Peace River every Sunday for groceries! Can't wait to see photos of them!
1) Quarantine: they will be pretty big at 12 weeks of age - esp being Brahmas

Can you make a temporary coop for them in your garage? I am told they don't fly much so you could likely get away with a 3' wall. I would aim for a 10x10 area if you can't free range them for a couple hrs a day.
2) Integration: If you can split your run up into 2 sections, they can see but not touch each other. I did this with Mr P, he could see the ladies but not touch them.
I am sure your group will be fine with them, I am eggcited to see them when you get them!