It isn't a good idea to keep more then 1 boa per enclosure. The main reasons behind this that I know of are, if one gets ill it increases the likelyhood that both will become ill, one will more then likely put stress on the other one which will lower the feeding response and also increase the susceptability to illness, feeding seperately is required to decrease the chance of accidental feeding response on the cagemate, and also if the animals are not of the approximate same size the larger one can injure the smaller one just by moving about the enclosure.
I know there are more reasons but it is too early in the morning for me to think of them..
Later
-----
Randall L Turner Jr.
www.aircapitalconstrictors.com
You never experience life until you have kids..then you realize what you should have done rather then what you did do