I encountered a problem with the information that I found on the internet about using a heater ac unit out of a 88 to 92 civic and Integra for my 64 Bel Air. Due to the imports along with just about every car built now, the heater box assembly is too tall to fit under the dash of the 64. The 64 has a transmission tunnel due to being rear wheel drive which is one of the many problems. The newer vehicles tend to have a flat firewall and concentrate most of the heater box in the center of the car behind the dash. So as they say the internet is 90% bs, it's true but I'm thinking it's higher percentage than that. My alternatives are to heavily modify the heater ac unit I just got or rebuild my old rusted out heater box and go down the road. I decided to rebuild and picked up a newer heater core today plus the gasket kit today reseal the heater box. The gaskets are foam rubber and runs about $25. The heater core was $50. Now due to my car being a factory ac car, I'm going to use an evaporator out of a 96 sentra that I picked up because it is the right size and it already uses R134. So after looking at the sheet metal and cutting out the cancer rust, I cut a 3 inch wide strip of 22 gauge sheet metal to replace the rusted section. I ran it through my brake to make the bends I need. I have a lot more to cut out of cancer rust but I will do one section at a time. I decided to cut out the whole bottom of the box and start over rather than try welding new to pitted metal. I could look for another heater ac box in a wrecking yard but I don't want to even know how much that will cost. It will be faster to just rebuild what I have and if I found another unit, I might have the same problem with rust on a 50 + years old part. Chop, Cut, rebuild and motor on! #designsbyandrew #metalworking #metalworkingnation #welding #fabrication #fab101 #migmonkey #sheetmetal #chevroletbelair #chevrolet #64belair #rust #heaterbox #acbox #bella #belair #restoration #xframe #bbody