SoCal,
BalsaUSA support should be able to recommend a starting point for your incidence settings. The settings have a lot to do with the relationship with the horiz. stab as Rock mentioned. They also have a lot to do with the airfoil type. My 1/5 Waco with Clark Y airfoils makes a ton of lift at -2 AOA, whereas a fully symmetrical would generate no lift at 0.

Assuming the Stearman has symmetrical airfoils, setting everything (upper,lower,stab) at 0,0,0 would mean the plane will cruise at some positive AoA to generate suffcient lift to maintain altitude. Setting the plane at 0,1,0 will mean the plane can generate some lift at 0 AoA keeping the fuselage more level than 0,0,0 reducing profile drag. Setting the plane at 1,1,0 will produce twice the lift as 0,1,0 at 0 AoA and may be required for a draggy biplane with exposed wheels, bracing wires, etc just to maintain altitude at cruise.

I have an Andrews Aeromaster with fully symmetrical airfoils. I have it set at -1,0,.3 because I (and many other Aeromaster owners over the years) have discovered the plane is too pitch sensitive at 0,0,0. Having the upper wing negative creates a more gradual progression in total lift (U.Wing + L.Wing Lift vs. AoA has a shallower slope).

I know from reading many of your posts that you are a highly experienced pilot and won't get into trouble with any reasonable settings. I would encourage you to start with BUSA's recommendation but experiment with the three numbers until you find the combination that works best with your kind of flying. Just change one number at a time and take some notes to share with the rest of us!
Crate.