Congrats on the new boa! I started out with one boa and a bunch of corns, 10 years later and I have 2 corns and a bunch of boas. They are such interesting snakes. The behavior you describe sounds fairly normal and I understand how it can make one wary, a bite from a full-grown boa is not horrible but it’s not exactly fun either. (in my photo album here at KS are some pics of when I got tagged by a 7’ boa, the full bite and wrap from an SFE.)
The t-shirt trick already mentioned is a good thing to do. It helps the boa get used to your scent and not see you as a threat. Consistent gentle handling will go a long way. If he starts bluff striking at you don’t let that stop you or he’ll learn that it works. You can use something as a shield (I like the tops of rubbermaids) to put between your hand and his face so you can pick him up and not get bit. Normally once they are being picked up they stop all the striking. I’ve been working for the past year on conditioning my snakes with water and a snake hook. When I open the cage, I mist them with water on the face and touch their heads with a snake hook. Then put the ‘tools’ down and pick them up. It’s been working and now as soon as they get the one mist and touch of the hook they immediately calm down, even the two that I considered ‘aggressive’ (some are just hungry all the time!). I usually pick up my boas from the middle, not too near the head, just lift them up with one hand near the middle and one closer to the tail to support the bulk of the weight. Some never completely calm down and as with any snake, it is a wild animal and bites can still happen. Just be persistent and constant with your actions and things should go well.
Good luck!
-April
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'There is a very fine line between "hobby" and "mental illness."' -Rainshadow