but you missed the point ..... in '70 they didn't build Chryslers at Belvidere.
So, the engine isn't out of a 300, New Yorker or Newport. It is out of a Dodge Monaco/Polara or Plymouth Fury.

Please post a fender tag pic of a '70 Dodge or Plymouth c-body with a "U"-code (E86) 440HP 4bbl.