Will a 2000 Impala 3800 series 2 motor fit in 1996 corsica?

No, a 2000 Impala 3800 Series II engine will not fit in a 1996 Corsica. The engine bay of the Corsica is significantly smaller and the mounting points are completely different. The 3800 Series II is a much larger and heavier engine. Even if you could physically cram it in, you'd have major clearance issues with the firewall, suspension, and other components. It's simply not a feasible swap.