440 swap from small block

Just wondering if it a real pain in the *** to change from small block to big block?
I have a 1974 Duster and wanted a run down on parts needed to do the job? I want to run stock exhaust manifolds ( what year and what car do i need them from)?
Oil pan
motor mounts
and anything else you can think of? do all 727 tranny have the same length will it fit in the same location as the small block tranny?
As you can tell I need info, any help would be great. If any of you have the parts kickin around to do the job let me know?