Lots of details in the 440 crank into a 400 block swap, but it is very common. As stated the matching piston compression height and rod length to achieve the piston to deck distance is the key.

A 3.750" stroke in a 4.375" bore is a "451 CID".
One way is a piston compression height (CH) of 1.320", rod length of 6.76". The compression ratio will depend on the head chamber volume (cc), the valve relief size (4cc), and the block deck height (piston to head).