It will bolt up the the turbo 400's from 64 and 65-66, the latter with the switch pitch transmission. The swap will require some machining on the center hole on the th400 flex plate to fit the 63 crank and a bushing as well. If you're going to do it, make sure you get all the wiring that goes with it. The dynaflow used a rod kick-down to shift it into passing gear, the th400's are electic. Get the carburetor and linkage as well to operate the converter and the kick down.
You can put a 200r4 or a 700r4 in but it requires and adapter plate between the block and the transmission. This web site has the adapters you will need
http://www.transmissionadapters.com/53-66_nailhead.htm
Good luck.
Ed
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