This is similar question to this question, but different scenario.
Let me describe the situation:
I am at KDYL in class G airspace. Accroding to ATIS the clouds are at 4700 scattered. I am going to fly west. I would like to fly below clouds. I will need to have 500 feet clearance below clouds in class E, so it is going to be 4200.
Do I have to comply 91.159? What altitude should I fly? Can I fly 3500 west in my scenario or I have to descend below 3000 and fly any comfortable and safe altitude?