Some suggestions, some have all ready been mentioned,
Leafspring car def go with the cal tracs, they work awesome
Change your front coil springs. The ones you have are way to stiff.
No sway bar. You can always disconnect it
front shocks, You would be best to use a true 90/10 shock. Calvert racing has them and are probably the only true 90/10 shock out there
Rear shocks, Rancho has an adjustable shock that works awesome, Calvert Racing again
Converter, Use a very reputable company that will build you a conv based on your engine combo, car specs and so on. Just buying a converter based on some one saying it has a 3500 stall speed or its advertised as such does not meen that is what it will be with your engine.
As bnickle said the opentracker rollerized front end stuff is excellent and will free up your front end greatly
If you get it all worked out and you are going tens at a track you will def need a roll bar/cage and other safety items or you will only go tens once and they will tell you good bye until you have the safety items required.
Remember its all about putting all that "600hp" to the ground and utilizing all of it. With a car thats set up for the "Street" stiff front springs and shocks, swaybar all your going to do is blow the tires off it. The older mustangs
suspension is very tempermental. You can either go fast at the strip "10 seconds" or you can go fast around corners but you cant have it bolth ways
Good luck!
ken
ken