The simple answer is yes to your heart rate. I too used to have one in the 80-90 range when I used to weigh between 265-270. I went to the gym and started running on the treadmill and lifting weights. I dropped about
40lbs and now m resting heart rate is anywhere from 50-60. I have had a full cardio work-up that have all come back normal. I would say you have nothing to worry about
. Then again I am not a doctor nor have I played one on TV.
Just giving you my own personal experience.