It is a common Colombian red tail boa. What GoingPostal is saying is that it isn't a true red tail, as in BCC (Boa constrictor constrictor) which are locality boas from suriname, Guyana etc. Good looking snake. For adults definitely probe, babies are easier to pop. Find someone who has experience doing this. How old is it? Im going to guess female...
For enclosure 4x2x2 is fine, but you don't really need that much height, unless you are into them climbing and having a ton of arboreal space. 4x2x1.5 is plenty to have some branches. Save some materials and money.
There are a ton of boa cage build threads. I would go with 1/2 or 3/4 inch quality plywood, seal to make water resistant. You then get to decide on door type, how you are going to heat etc. Lots of variables.
I am in the process of a cage build now, if you want to discuss further let me know.