440 to Hemi be changed o go from a 440

I have built both 440 & 426 hemi A bodies without using aftermarket K frames or mounts.
I didn't track down the factory original parts as they are rare and generally more expensive than I would/could pay.
The K frame & mounts do not interchange between the two engines. Nor do the headers.
The same oil pan, water pump housing and bell housing can be used on both.
Hemi has 8 bolt crank flange to 440s 6.
To install a 426 Hemi with the rubber mounts as Chrysler engineered is not a bolt in but can be fabricated.
One was no tougher to fabricate than the other but the Hemi was more difficult to research how it needed to be built.
Of the two I feel the Hemi is a better fit than the 440 since the exhaust ports are facing down.
If you don't wish to fabricate everything as I did SS&AFX has a weld together hemi mounting kit
and Tti makes some headers.
Be prepared for some tight clearances.
I enjoy doing the fabrication and was worth the effort for me.