I have a metal-on-metal rattle coming from the engine compartment. The engine is a 350HO with a ST-300 automatic. The trans has just been rebuilt so that shouldn't be the source. The noise is more noticeable when the engine is hot. It doesn't make the noise when idling or revving while parked. It occurs when moving and applying a slight amount of throttle after coasting. It also occurs at constant speed, and to a lesser degree under breaking. I'm thinking that it might be a timing chain or possibly the starter but wanted a second opinion before tearing into it. Thanks for your help.