UPR usually has a combo deal where you can buy an aluminum quad and FWA together for something like $35 or $40 (can't remember, my memory is crap). Frankenstang has identical setups on her '89 notch (used to be mine) and her '80 Capri - UPR quad and FWA, and stock Ford cable - and they shift like buttahhh.

If you do wind up needing a cable, I'd recommend getting the "universal" Ford cable from Maximum Motorsports, which is about $75 shipped.
A couple quick notes if you do wind up needing a new cable and get the above one. First, you'll need to transfer your stock retaining bracket (holds the cable near the frame away from the headers) from the old cable to the new one - no biggie, just bend the loop open a little bit, swap it onto the new one, and crimp it back down a little just to hold it. Secondly, with just about ANY brand FWA and a stock cable, you'll need to remove the rubber firewall grommet and then cut or file down the four little plastic nubs or barbs or tabs or whatever you wanna call 'em ... the sticky-uppy things that held the rubber grommet in place ... so you can insert the cable sheath into the FWA. And thirdly, if you get a multi-hook quad, start with the hook closest to the firewall and have the FWA screwed all the way in, then back it out to take up the slack; if there's not enough adjustment, screw it back in, move the end tab to the second (middle) hook, and then screw the FWA back out again to take up the slack.
With any FWA, the adjustment rule is: more cable slack (looser) = clutch engages with pedal closer to floor; less cable slack (tighter) = clutch pedal engages higher. (This is why your clutch is having issues now - the cable has too much slack in it, and the stock plastic auto-adjusting quad can't tighten things up anymore, so it's not allowing you to fully disengage the clutch when you push in the pedal.)
Usually, I can set the clutch cable almost perfect on the first try just by pulling the cable sheath out towards the front of the car and screwing the FWA out until it just makes contact with the firewall end of the cable sheath - from there, if I want the pedal to catch higher, I give it 2 or 3 more turns to tighten it up.