P0171 and P0174 together indicate system-wide lean issue. Most likely intake manifold gasket, PCV system, or MAF sensor. V10 known for PCV elbow and intake gasket issues. Smoke test recommended to find vacuum leaks.
P0171 lean code with no drivability issues is safe to continue driving for your Florida trip. Monitor for symptoms. MAF cleaning was good step - may need replacement if code returns. Check PCV and vacuum lines when convenient.
Without seeing the picture, that dangling 'gizmo' near cylinder #5 on your 2000 Ford V-10 is likely a vacuum line, wiring harness clip, or emissions component that's come loose. The Ford V-10 has several small components in that area that can work loose over time.