If they boiled out, you almost certainly did damage; how serious depends on luck. Sometimes batteries can partially recover but you definitely reduced their capacity - how much can be best determined by load-testing. Alternatively, you can get an idea by checking sp gravity once recharged but that isn't as conclusive.
Absolutely check each cell with a hydrometer as one bad cell, which is almost inevitable in this scenario, will kill the entire bank.
My friends and I are all located in or near Lexington Park, MD 20653. We would love to see a O'Reilly Auto Parts store here. Between advance auto or autozone, there is no experts here that deal with parts. Please start up a store here with some expert personnel.