I care about this stuff as well and so have a spreadsheet with all of Pollack’s dunk totals. He had 1,188 dunks in his 4 seasons before nba shot tracking begins in 1996-97. That includes 381 in 1993-94!
Pollack tracked 76ers dunks starting in 76-77 and then did it league-wide starting in 1987-88
The 1988-89 guide is the first one with league-wide dunks data (covering the 87-88 season). The older guides back to 77-78 have dunks for Sixers and their opponents (in games vs the 76ers) starting with 76-77. So it has full NBA coverage for Dr J, which is great, and also Barkley.
You’ll never guess the leader in dunks from 87-88 through 95-96, though: Otis Thorpe!