First mistake was starting with an 8 foot snake. Its best to start with a hatchling and working your way to raise it up. That way you and the snake get to know each other. And you relize your limits with it.

Second I doubt its a burm/rock theres only been a handleful produced and last time I saw them for sale they were insanly expensive. Rocks have a really bad rep but Ive seen many rocks that were just as nice as any other large snake.

Good luck with whatever you do just be careful. If you feel you can not handle the animal please find a responsible keeper that is ready to take on a large constrictor