Yep, you should be fine with that poundage. I guest of mine took a nice bull last year with a 60# bow, 29" draw, gold tip arrow, and a NAP Razorback head. It buried to the fletch! No problem! Just remember nothing beats a well tuned set-up. If your arrow is flying true it will deliver more energy into the animal than an arrow that is out of tune. Many people skip that part, and it is one of the most important things you can do to prepare for the hunt. Tune your equipment, and then when you are done, tune some more untill it's perfect. The animal you are hunting deserves that respect. And I strongly believe in a fixed blade head like the thunderhead you mentioned is one of the best.
Good luck on your hunt.