Falcon and Mustang parts
I had falcon, mustang and Comet. I have a air for 65' Caliente, all restore. I have a overdrive for 1960 falcon to 1964, mostly those 6 inline, some use a small 298. The driveshaft is small, I have seen them, everyone want to pick a V eight. I had a 65 Ranchero, I sold it, the 200 cid with three on tree.
The overdrive can to change for F-100 to 240 or 300 and get better gas. I have alot of overdrives. What year of your model? The heater is the same of all meet. Mustang heaters the same.