commando1
Old Man with a Hat
Sierra? Same 440 displacement,Interesting decision. I fully understand the desire for a "drop-in" situation.
As I suspect they'll be searching for a buildable core, you might need to look at your accessory mountings on the existing engine to ensure that they get a core with the same attachments. I know this sounds "not needed, they're all the same", BUT a few years ago, a customized Sierra wagon came through our shop. It had developed a lower engine knock, so an "engine" was procured from an unknown source. Same 440 displacement, but the accessory mounts were all different, which also included a few which needed a matching casting difference to work.
So, they might need the casting number and date from your existing engine so they can look for a matching-casting block. I'm not sure when the castings might have changed, but from what I saw, they did.
Congrats and good luck!
CBODY67
I will take issue with this. Unless it's a industrial/marine block, once the water pump housing is removed, the 66-78 440 bare block should be the same as far as mounting any external components.
And I would think the same for the 400.