http://67-72chevytrucks.com/vboard/s....php?p=3944592
here is what i had done to mine. i am not sure if it would clear the blazer gas tank though. My system is bagged and the exhaust barely touches the axle when the axle bottoms out on the bump stops.
If you cant find anyone that thinks they can route the exhaust over the axle.....you havent found anyone that knows how to route exhaust. i would look for a mom & pop muffler shop, usually you can find someone who knows what they are doing there.