This one is for you MOPAR gurus out there... I am planning on upgrading an unmolested '61 Imperial, equipped with the tired original 413 & cast iron push-button auto. I would really appreciate some input regarding things I may not be expecting (large or small). Scroll down for the broad strokes of my plan. Thanks in advance. Here is a picture of the subject vehicle: Here's what I want to do: Swap in (and detail to look original) a '67 440 from a 69k mile Imperial that I have on a stand. Swap in a '63 727 torqueflight (aluminum, pushbutton with a park lever) from a complete Imperial parts car that I own. Swap in a later 8 3/4" rear from a '66 Imperial that I have, in order to get away from the stupid early axles with shims & tapered keyways. Here's what I think I will run into: I expect numerous large & small items will have to be swapped from the original engine for mounting, as well as the exhaust manifolds, etc. I expect some fabrication will be required to mount the later transmission, but maybe not. I plan to use the '63 converter/flange/linkage, etc. I also expect that the shifter cable connection will be relatively easy to adapt. I plan to attach the park lever/cable control to a separate control cable. The differential has the same suspension (spring & link) connections as the earlier car, as the frames were close to identical. I will have to adapt the later style parking brake cables up to the original pedal, but that should just take some head scratching. The differential & carrier bearing assembly will likely need to be modified, but the one in the '61 has been rebuilt, and I have a good original still in the '63 as well as an extra on the bench. Should be enough parts to work with.