I have a 74 challenger that the complete heater box assy. is missing. I found one out of a 70 challenger today. Will this work in my car? Im not sure, but my thoughts were that the blower motor on the 70 is different than 74? Again, not sure, just want to find out what you guys think. Im sure somebody knows if this will work in my car. Dont care about originality. Thanks in advance.