Alright, after a lot of back and forth, I've decided to keep my 1995 Mustang GT. I have a bit of money wrapped up in it and a ton of parts for it. Its cheaper in the long run to just keep it...
Now, the steering is shot. The PS pump is on its last legs and the rack leaks pretty badly. The tie rod ends are a little loose too. The car has 160k miles on it. I am thinking about converting to manual steering. It takes about 30 lbs off of the nose heavy Mustang. I'm also taking the A/C off and the car has a tubular K-member. I am looking at the Flaming River rack and shaft kit. Now to choose the standard ratio (20:1) or the quick ratio (15:1) rack. I've heard the quick ratio requires more muscle to crank the wheel and can be twitchy on the street. The car is a DD but I'd like to do a HPDE sometime.
So, would the standard ratio rack work better for a DD? I was also going to replace the rack bushings with solid aluminum bushings. Yes? No? What does GRM say?
Think of it this way, 20:1 is a drag ratio. You don't want any super sudden movements or it's into the barrier for you. 15:1 is a better turning ratio and most likely the people who complain they are twitchy are the ones not used to the non assisted motion that takes a brief moment to react.
The factory loves rubber to reduce NVH at the expense of feeling anything or connected to what you are trying to do.......
I think the standard ratio rack with be fine... I dunno if the aluminum bushings will work with the Flaming River rack and my QA1 tubular k-member. The rack comes with new bushings though... the current ones on the car appear to be poly but are squishing out badly because the PO over tightened the rack bolts...
I just have to make sure this is what I want before I commit because its about $600...
Granted its a Fox but my build would be a perfect set up, however it is heavy, awesome but heavy.
I have the flaming river rack, steering shaft and offset aluminum bushings
http://grassrootsmotorsports.com/forum/grm/86-mustang-challenger-build/41304/page2/
Aussie, your Fox build is inspiring! Have you noticed any NVH issues with the aluminum bushings?
I know the stock rag joint is crap. It does it's job by keeping NVH to a minimum but it also numbs the steering feel by a bit. I'm hoping to pretty much eliminate the slop in the steering but still have it be streetable. It drives like an old Chevy farm truck right now. The new rack, coupled by the new steering shaft and aluminum bushings will hopefully make it steer laser sharp.
After owning this car for about 3 years, I have been systematically replacing original parts and the terrible second-hand crap the PO put on. I have new Tokico D-specs to replace the beat up, used Lakewood drag stuts/shocks. I have already swapped in lightly used Steeda Superlite springs (discontinued awhile ago) in place of the cut stock front springs and el-cheapo cobbled together rear coilover kit.
Now, after sitting for 7 months while I was deployed, the power steering has a terrible flat spot in the assist. It makes a clunk when moving the wheel quickly and pretty much feels like crap while on the road. The rack is leaking from both bellows and the PS pump is louder than the normal Ford PS whine.
I've always wanted to swap a manual rack in due to the overboosted, floaty feel of the powersteering system. Now I have a good reason! 
It works but as I stated it is heavy, you really work in an autocross, but it is precise, I love it,
Still have work to do, understeering but the tires, inflation and maybe rear bar are the most likely causes of that
If you autocross it, keep the power steering.
Some friends who run FFR cobras have shown that the power steering makes them MUCH faster because of how much effort is involved.
I could use some upper body toning so I'm ok with some increased effort LOL
Its sounds like it's totally worth it though. What steering ratio did you go with?
If you are not scared of wrestling your car, especially in an autocross, don't use the power steering, however if you want a nice comfy ride go ahead and keep the PS>
Mine is a fight, and it respects being thrown into a turn.
Didn't hit a single cone BTW.
Did I tell you it would be heavy 
20:1 ratio but I also had to go with what I got a deal on, ya know that whole challenge, budget thing,
I drive it on the road and have no complaints regarding NVH, this should have been stock.
