440 to Hemi be changed o go from a 440

agree w/ the exhaust ports being better for headers. I`d use a motor plate w/ no motor mount stands at all on the k frame. my 505 (wedge) is race balanced from hughs, it has no vibration at all w/ a motor plate
got to love auto correct. ill say it again from my laptop/. what will it take to go from a 440 to a 426 hemi in a duster?