Gypsum Calc. Chloride Epsom Salt CaSO4 CaCl2 MgSO4 11.1 3.2 6 12.9 3.7 7.0
Based on boiling 13.90 gallonsliters at 1.000 for 60 minutes, this will decrease your wort by 1.00 gallonsliters, bringing your after boil OG to 1.000. You wanted an OG of 1.074. It looks like it will be under.