I installed an FHO (For Hemis Only / Canada) Hemi in a 72 dart,.....they use the same block. Not sure what heads / valve covers you are planning, but the mandatory to seal cast aluminum valve covers are huge and required a custom offset master cylinder bracket that not only moved the master over....but up. might want to test fit heads / valve covers before you put away the thinking cap and hammer.
Take note of the small plug in the oil galley next to the starter. this one required a little grinding / massaging to get the mini starter to fit. FHO noted that where most of us would normally install the oil pressure gauge port at the rear / top of the block near the intake is not sufficient and used one of the ports on that oil galley on the drivers side.
you likely already know the above but as I tell my wife....."just tryin' to help.