Gypsum Calc. Chloride Epsom Salt CaSO4 CaCl2 MgSO4 10.7 2.7 4.9 10.1 2.5 4.6
Based on boiling 13.90 gallonsliters at 1.063 for 80 minutes, this will decrease your wort by 1.33 gallonsliters, bringing your after boil OG to 1.069. You wanted an OG of 1.074. It looks like it will be under.