Where was it rubbing? Front or rear of tire = caster, Top of tire = camber. Did you do any adjustments after the caster adjustment? Caster adjustment will change your toe in and camber settings so you want to do them in a specific order.
You should do fine with factory settings but I agree with Worth that you might want to drop the rear an equal amount as you did in the front.
First check and write down all three settings then start by adjusting your caster.
Next do your camber and last toe in.
After adjusting all three then check the settings again and fine tune if needed.
Here are some general settings from a supposed mustang expert but there are performance settings out there if you Google them.
You will notice that there is a difference between left side and right side and also between manual and power steering.
These are stock settings using radial tires.
I've always tried to keep mine the same from side to side but that's just me.
I put my cars up on the car dollies that you use to roll your car around in the garage under all four tires and I push
down on the front and rear a few times to make sure the
suspension is settled down.
Model Year Caster In Degrees Camber in Degrees Toe-In
’69-’70 Power Steering Left: +2 Right: +2½ Left: -¼ to -½ Right: -1⁄4 to -¾ 1⁄8 to 3⁄16-inches
’69-’70 Manual Steering Left: +1⁄2 Right: +1 Left: -¼ to -½ Right: -1⁄4 to -¾ 1⁄8 to 3⁄16-inches
