There were 2 common intakes, the 350 horse motor with the Holley carb, and the 375 horse magnum motor with the AVS Carter carb. I don't believe there was much if any difference between the 69-71 440 RB Magnum intakes. They never made a 71 4bbl with a shaker, I believe all 440 E bodies were 6 pack equipped for the 71 model year.
3512501 part # is not listed for a 71 E body with a 440, it's listed for B & C bodies.