I believe the bell housing bolt pattern between the 59 361 and the 68 383 are the same, Chrysler was pretty consistent concerning bell bolt patterns.

As far as the rest of the stuff? Most of the guys that did such swaps are no longer around, or couldn't remember for sure. The crankshaft issue would have been the end of the swap for most guys. I'll go out on a limb here and say the 361 motor mount brackets will probably bolt onto the 383. You will have to use the 59 body end of the mounts in the 59 car, that I'm sure of, unless you want to do a lot of redesigning.

If you really want that 383 in that car, do whatever it takes to put the 383 trans in the car as well. Its going to be easier to manage shift operation and deal with emergency brakes then it will be to deal with crankshafts, and the 383 trans would be a better trans. Gene