4bt 72 Dart

I need to remove more of the hump up under the heater/air-conditioning foot vent, so that vent needs to be removed. I plan on using an aftermarket a/c system for a few reasons. But, what if I could get help with, or directed in the right direction, because I can't find it. But, were do I start to remove the foot vents above the trans hump. You can see were they are in the last posts pic. I am not sure if I have to remove the dash first. If so, I have seen on here that it is easier just to remove the glass, which I need to replace anyways (because some kid shot it with BBs).

I just need the trans to come up a bit more. To get the angle correct and the engine high enough for the pitman, idler, cross link to clear. I'll need to remove the dash eventually, to install a new dash pad and air unit. So, that many be what I need to do now, I'm just not sure where to start.