Oh, never put a boa into an enclosure with a python. Boas can barbor IBD (inclusion body disorder) and never even show symptoms of it. This disease is fatal to pythons; just do an Internet search on it.
I used to even go so far, as to keep my boa in a seperate room. Now I just make sure to completely disinfect his cage often (as I do all of them) and I NEVER handle one of my BPs on a night that I handled my boa.
IBD has wiped out people's entire collections; please don't tempt fate.