One thing that I didn't see anyone else address, is the fact that adding the TA/PHB rear set up without making comparable changes to the front suspension will cause a dramatically unbalanced handling car.
If you run a TA or 3-Link/PHB set up in the rear you will have to run significantly stiffer springs ( and shocks that can control them) like j rick kirby & fast-frank-d suggested.
I have run both a TA/PHB and a 3-Link/PHB set up on the rear, while keeping the front suspension in a stock type configuration. Both cars went from balanced, fairly neutral handling to excessive understeer. I switched both cars to the MM TA-5 rear springs which helped. I also turned the front shocks to there softest setting. Not the best solution but it has helped until both cars are switched a coil over front set up. Oh and we ran an aggressive front alignment on both cars.
This is something you will need to consider both as a budget concern & handling concern.
Thanks. Yeah I plan to do coil-overs in front eventually but because of my budget I will have to get there in stages. First stage is the rear. I already have a PHB and I just ordered the TA on black friday. I plan on getting the new TA springs too. Bad news is, I just found out my SFCs aren't sufficient so I have to have them cut out and MM SFCs put in. I don't know how much that will cost. I also can't afford new rear shocks right now. I plan on getting coil overs next (in 6mo or 1yr) along with new shocks all around. Then maybe (big maybe) new k-member, a-arms, and adjustable height LCAs.
1994 Mustang Cobra #662,347 Stroker,AFR Heads,Trickflow Intake,Anderson Cam,LT Headers,Flowmaster
TR-3550,Centerforce Clutch,31 Spline Axles,42lb Injectors,90mm MAF,SCT Tune
Steeda Suspension,FLSFC,Edelbrock Shocks,18x9.5 Forgestar CF5,Hankook RS3 Tires
Dyno'd @ 366rwhp 378ft/lbs