Who told you 904's uave 2.77 1st?
904's and 727's have 2.45 low.
904's had an option of 2.77 but it is a 998.
Mopar speed secrets suggest 2.77 but when the books were written 4" stroke smallblocks didn't exist.
2.44 is more than plenty gear.
Actually a 2 spd 1.80 first is more than plenty...