A 440 with a six pack or 2 fours and around 10.2 - 10.5:1 pistons is rated for 490 ft/lbs. in a few years offered, so using a similar (or better) cam, heads, exhaust, etc., will get you there. I had to go back to previous threads to verify you are rebuilding a 440, not a 340 - that may have been the confusion from others as I wasn't sure myself.
I think you are correct, the way we interpret what you write may be creating the pucker factor from our side. I feel a little better after reading your last thread.
IMO, the crank (if not brand new) at the very least should be gone over to verify no cracks, wear & for straightness. Double check bearing sizes, even if new. I've bought brand new stuff only to find out it wasn't exactly right. The shop should have done this for you if you gave them the crank, or at least asked you.
Again, IMO, pistons are mandatory for the honing job, not as much for the boring, assuming you are using brand new pistons. Ideally, yes, it's better to have ALL your internal parts (some external) on hand to get a more precise fit and balance.
And it doesn't take much to weigh the pistons and rods individually with a proper scale to balance them. My rods were a little off and some grinding off of the cast marks got them dialed in dead nuts. Didn't cost anything but my time and some grinding stones and polishing sandpaper wheels liked used to port/polish heads.
I am more of a back yard mechanic and will accept more tolerances in a street car motor. Others here are more professional and are sticklers for exact perfection. If funds are unlimited and your not in a time crunch, go with the pro's recommendations, well, because they are pro's!
And pro's, if I'm WAY off base on any of my comments here, please tell me and Colton.
And there are no hard feelings on my end. We all want the best obtainable for you!