Any bodybuilding contests on the horizon in the next year or two? Going to a relatively-fast bulk and gaining so much more bodyfat now will make it that much harder, if that's a factor.
Shooting to gain 20 pounds in 8 weeks? I see nothing good coming from that, especially starting in your current condition.
At that size, you might end up with boobs. So expect the confusion to continue.
Read through this thread:
Most guys who tried that approach regretted it in hindsight. Learn from those dudes.