Ive been reading daily and daily and cant find much for definate answers... I recently got a 64 Fleetwood 75 Limo. The current 429 needs a rebuild. (cracked piston and more) After looking at cost etc, and the added fact this is going to be a driver to shows up and down the east coast. The availability of parts is also a huge concern. That being said, and me knowing I will probably piss off some Caddy die hards, The Car is going to be Big Block Chevy powered. I have a motor I am getting for free, And plan on just refreshing it. Now here is where I cant find much for answers. It currently has a Hydra-Matic (Jetaway) trans in there. NO one makes adapters for the Jetaway to other motors. So I am planning on a TH-400 behind the Chevy. The question is, Since its a split year 64 Commercial Chassis, Am I still going to have to get a driveshaft made? How about hooking up shifter etc? Tranny Crossmember mods? I have 2 welders and the tools to do the job. I just like to get all my knowledge straight before I dive into something. If this is something covered on here before, call me a dipshit and send me in the right direction. Any help is apprciated.