I'm in the process of stripping down the engine bay of my 79 malibu to clean it up and get it ready for paint before starting a 5.3 swap. I've got a couple questions. First, how the heck do I remove the AC/heater box? I've removed the fender skirt, and I've removed all the bolts on the outside around the box. I disconnected the wiring from under the dash, but when I try to remove it it still seems like its hanging up around the heater core. Is there something I'm missing? Maybe some more wiring connections? Is there anything that has to be unbolted from inside the car? Second question is that I really want to keep the AC when I do my swap since its going to be my DD, is the original AC/heater box the only thing I can use when doing a swap, or is there another box that I can use in its place for AC/heat? The reason I ask is that I'm really trying to be careful not to tear up the one that I'm trying to remove, and it almost seems like there might be some clearance issues when swapping in the 5.3.