Does this mean that 20 teams from the old 4A will now be added to 321A
Yes, 4A going from 64 to 36 schools will see 8 schools move up and 20 schools move down.
Old:
6A = 32
5A = 32
4A = 64
3A = 64
Total = 192
New:
6A = 36 (+4 from 5A)
5A = 36 (+8 from 4A)
4A = 36 (-20)
3A = 64 (+20 from 4A)
Total = 172
IMO it will help improve the post-season level of competition for 321A.