I have a 67 Eldorado, the Motor is ok, but will cost a lot to buy a new/rebuilt motor. I found a 425 rebuilt motor, would this fit into my car? would this be a mistake to swap it to the 425? The 425 is still a 7.0, but the 429 does not have any upgrade parts for it, I put Fuel injection on it and it runs better, but I want to make it more of a pleasure to drive with easier parts to find. Anyone have any thoughts? I know some of you will think I am crazy to want to do this, but the 429 is so hard to find parts for and mostly year specific , Please help with ideas if it will drop in and can I use my Original Transmission.