junkyard 440 approx price?

Around here, for complete running 440s, they go for $400 to $500 if it has the 727 trans. They would probably need a rebuild (i wouldn't trust them) and that's if they were pulled and stored inside right away. That includes all accessories such as pulleys, mounts, distributor, etc. carb to pan. That's for a forged crank one of any year. Cast crank ones are about $100 less. A good bare block would go for $200. You can get a set of stock cast iron heads for $50 for cores (or less).
400s and 383s go for another $100 less per engine.
H.P. engines you can add another $100 on all counts.
That's here, they are plentiful if you know where to look. Same as small blocks and slant sixes.
Actually, the slant sixes are harder to find, go figure........