Gypsum Calc. Chloride Epsom Salt CaSO4 CaCl2 MgSO4 10.2 3 5.5 13.4 3.9 7.2 12.5 pre sparge, stop at 2.5 gallons
Based on boiling 13.70 gallonsliters at 1.063 for 60 minutes, this will decrease your wort by 1.00 gallonsliters, bringing your after boil OG to 1.068. You were planning on an OG of 1.068 so you are right on track. Nice job!