This is a something I am seriously thinking of doing. I have a 1963 Futura with a 289 that smokes a bit. It's not horrible but it gets worse the longer I drive and people behind me are giving me hand gestures to show they are unhappy with this engine. I also have a really fine 200 from a Mustang that was given to me by a friend that is sitting on a stand in my garage. I have no idea how much it will cost to repair the 289 (probably rings) but I would probably want to throw some good time and money at it. The 200 was looking at me and I suddenly thought it may be cheaper to change out the driveline, the radiator, the exhaust and use the 6 cylinder. Don't worry, I have the correct C4 6 cylinder bell housing in my garage. Is this a good idea or should I just pull the 289 and do the rebuild it needs? BTW, I do love the rumble of the V8. A 289 and C4 is a pretty cool combo. This is both a financial decision and a mechanical one. I am pretty decent working with 170's and 200s and the 289 is kind of shoehorned into the falcon. To be honest, I am a little intimidated by it. Just some advice would be a good start.