Some aircraft will exceed VNE , turbulence Penetration, Flap extension speed limits in Level flight at WOT. With any descent It will compound the Problem. With a fixed pitch Prop is May easily overspeed the Motor. If this is Likely shutting down the Motor is the Only way to avoid it. Risks are too high otherwise BUT you can Pick the Point where you do this, and do it wisely. Starting some engines on full throttle is Unlikely to succeed. Your main task is to successfully do an engine out landing and that's not rocket science. It's a good question to consider .It could happen. . Nev