A gen III is wider dimensionally than a 440.

A hellcat will fit into an e-body with no modifications.

A hellcat will fit into a b-body with either shorter adapters to the supercharger water manifold, or by modifying the firewall for clearance.

Either a nag-1 or the 8hp series transmissions will require tunnel mods as they are physically larger than a 727 or 833.

Both of those transmissions require controllers as they are out of newer vehicles.