88workcar,
Right now with the set up I have the engine shop said I would be running around 370hp. While it might seem like a large throttle body for that amount of horse power I want to leave myself enough head room to put on a supercharger or turbo in the future.
I was origionally going to go with a Edelbrock 70mm TB but found out today that edelbrock is discontinuing their line of TB's for mustangs.
Thanks for the replies all, keep up the great info!