What cam do you have?
How much compression?
What type heads? Are they ported?
What is your rear end gear ratio?

Stall is basically how high the engine can rev in gear without the wheels turning. Higher stalls let you get the engine up into its peak torque range when launching.

In general, for the street you want 2500-3500 stall but you need to furnish more information for us to give you an educated answer.