I'm doing the same thing (installing a 440) in my 1963 Fury that has a 1962 V8 K member(one year only) in it. I bought a 1966 to 1971 B body K member so I can fit the later 6 quart low profile street hemi oil and the later more plentiful headers on it
As already mentioned that moves the motor back and down for better weight transfer as well as using the later motor mounts and you don't need to worry about finding a 1965 pushbutton 727 so you can use a slip yoke U joint instead of the dreaded ball and trunion driveshaft
Elephant ears or a front motor plate are viable options also if you aren't oppose to using them
Good luck