putting a ford 5.0 in a 72 Dart

Not entirely true, the gen 3 is 27” wide, the coyote is 29” wide. Doesn’t sound like much of a difference until you realize that a small block is 24.5” wide. Essentially the coyote is the same width as a 426 Hemi, just not as cool.
You did actually read what I wrote correct? Nowhere did I say anything about the gen 3 hemi.