Brewing on short notice. I am pitching two vials of yeast since i don't have a starter.
Based on boiling 7.20 gallonsliters at 1.064 for 60 minutes, this will decrease your wort by 1.00 gallonsliters, bringing your after boil OG to 1.073. You wanted an OG of 1.074. It looks like it will be under.