Most boas dont have the heat pits that you see in pythons. Though some tree boas such as the emerald and amazons do have heat pits. They do have a jacobson's organ. I dont know of a species off hand that doesn't have a jacobsons organ. As far as hunting, they use their tongue to retrieve chemiclals in the air. Certain things such as a rat will give off a certain "scent".

And thanks for the compliments guys.