Early 70's A'904 Torqueflite downshift

DLJ said
At Wide open throttle in drive, it will hold till 2,500 rpm max to shift into 2nd, then in 2nd gear at wot it will hold till 3,000 rpm then shift to 3rd.

That's not shifting high enough. The lack of part throttle kickdown is a separate issue, IMO. You don't have enough throttle pressure as it is, IMO.