Will a Pontiac GTP motor fit into 1997 Grand AM?

No, a Pontiac GTP engine (typically a supercharged 3800 Series II) will not directly fit into a 1997 Grand Am without significant modifications. While both cars are Pontiacs and share some platform similarities, the engine bay and mounting points are different enough to require extensive fabrication. You'd be looking at custom motor mounts, potentially modifications to the firewall, and possibly exhaust and other systems. It's a major undertaking, far beyond a simple swap.