IRS replaces PHB/TA and I would NOT go there with a GT if you're going to put it on the autox course. It'll frag the IRS in no time. I spent over $3K in repairs to mine when I had it and I only drove it on the street for the most part.
To just eliminate that side to side wiggle all you need is a PHB from MM. Add coil over to the front and rear and you'll handle twice as well as before with proper spring and shock selection. Race valving is BAD for street cars. I'd start with the MM sport valve which is still pretty stiff. I use them.
The TQ arm is fantastic and changes the cars feel 100% from the 4-link. I'd start with the PHB and decide if you need more rear grip or more rear control. If you're not able to keep it on line with the 4-link then the TQ arm may be right for you.
You could also try a Watts link. It'll handle better with a tq arm and watts link. I think Global West makes them for Stangs.
If you want to discuss your specific car and needs at length I suggest we take it to AIM/YIM so I can respond in real time. You can find me on Yahoo IM at cburnss. If I'm on you can ping me.
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