i did this today. ended up removing the exhaust as the instructions say just because i didn't want to deal with coolant all over the exhaust and it made it easier to tighten up the heater. I did use the new style heater because it has better heat shielding and is much further from the exhaust. I forgot to take a pic of the clearance but it is close to 2" of clearance
and this is where i routed my cord too because I have a timer i use at work and it is easier to leave it under the hood.