Welcome to the world of Boas, soon.
Warm end side for a BRB should be 85 deg MAX. 83 deg is optimal.
Cool end side should be approx.,. 73 deg. Extended periods of time with temperatures 85 deg and warmer WILL harm your BRB.
Humidity for neonate BRBs should be 90%+, with larger snakes, humidity can be 75-80% provided they have a large water dish and or moist hide for soaking.
Hope this helps.
P.S. Snakesitter will be here later.