If you want to do FS's then I'd would just substitute that in for your squatting movement.
Take a look at this page it has a FAQ on how they estimate starting weights and the progression.
http://startingstrength.wikia.com/wiki/FAQ:The_Program
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"And for crying out loud. Don't go into the pain cave. I can't stress this enough. Your Totem Animal won't be in there to help you. You'll be on your own. The Pain Cave is for cowards.
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