I believe the part number you are looking for is 2892 471 My parts book doesnt list a different number for a 440 6pk and any other 440 In fact it lists the same part number for a b,j,p,d,c,y carline with a 318 ,340 ,383, or a 440 . This is also the same part number as the 1971 line including the 360 .
Hope this helps
Good luck
aarcuda33