www.mustangsteve.com is a good site for classic stang information and diy modifications. I visit stangnet and the corral daily, but they are better for late models as thier classic sections are usually dead.
www.svtperformance.com has some good people. Don't know exactly what they offer for a pony as old as yours, but couldn't hurt to go to the site and browse around. Good info on my Cobra though.
Yup, I am on that site and also All Ford Mustangs (AFM) http://www.allfordmustangs.com/forums/ too. Same user name as here.......and many more posts too than here.
As far as working on a mustang and great how to's this is where I go... http://www.mustangmonthly.com/
Me and my daughter restored a 66 mustang and this place was the bomb!!
it is by far the best forum for classic mustangs on the web. I have been surfing classic sites for a long long time. There are many that are good (mustangsteve.com, vintagemustang.com) but none are as good as mustangsandmore.