sorry i slept in, yes it's a 250, glide tranny, holley 390, clifford intake, with headers. The grinding sound is loud enough for my to hear from the inside of my car. I am thinking somewhere from the tranny area or MAYBE back of the engine. It is hard to tell since my car is pretty load now. So if you have any ideas on what would be causing this please be specific. I learn as i go and don't have a big automotive backround or knowledge base. (but it is growing everyday thanks to people like you)

Thank you guys alot for your time a knowledge!