I got my heater from Whitby Motorcars so I'm not positive they're the same but mine looks like the same unit that Tri-States sells. My heater is mounted right in the middle of the dash just like you're suggesting. It sticks into the engine compartment a good bit but it fits. The only problem I have is that there's so little room between the heater and intake that I can't even get to stuff behind the engine (like PCV valve) without taking the intake off. Some of that is my fault though. I was so paranoid about having enough room for gages and wiring that I probably stuck it too far into the engine compartment. Anyway, putting the heater in the middle of the car does free up the passenger side for a glove box.