Posted a pic that is easier to read.

Below is a paragraph from the Mopar Performance 'Mopar Engines' book; pg.277.

John, there is one or two valuable threads here on Moparts the past few weeks that the guys have offered up alot of info and with factory documents, sales ads, and much more concerning the 1968/'69 B body 383 4bbl's.

For whatever reason(s) - Mopar decided that ALL 1971 383 4bbl's would share the same 440HP cam.

It would not be too far off to speculate that this same decision had taken effect after 1969; and for the same reason(s); only it began with certain chosen models - like the new for '70 E bodys (B/J) and the other 'perfromance' models (R/W.)