Best headers on the market are the Hooker Supercomps.As far as other parts there is Mustangsunlimited.com, National Parts Depot, Oklahoma Mustang, California Mustangs and more. They all have 800 numbers as well.
If you can afford it get the Jet Hot Coated headers.
If you have any other questions I did a 65 Coupe from the ground up. E-mail is rfedd@aol.com...Page is at
www.rfedd.bigstep.com. Pics of the finished project.
Ron