I am by no means an expert, but a few simple things.
1- Improve the coil springs up front, not sure on the rear leafs asside from getting new ones.
2-sway bars! I would thing a mustang piece would work, but I have a couple from 72-76 cars that could probably work. If all else fails, try to find an older junk yard, and see what's out there. Maybe some car would have something that you could adapt. 2 door Torino bars will bolt right up.
I picked up a bar off a f350 dualie for my 1979 4x4 f150, just had to get some new endlinks, and drill a couple holes on the frame.
3-TIRES and RIMS-if you are running factory 14"x6" rims and running skinny bias tires, time for an update.
You could stick a set of 15"x7" stock ford steel rims on there, do maybe a 225/60/15 tire, or even like what I did on my '72, run some 16" police steel wheels and run a 245/50/16 performance tire.
I don't know what rims and tires exactly work on your ride, but do some searching on the web, on ford sites.
Keep in mind, you could even bump up to a big diameter rim, but how much cash you want to spend. a 15" tire is gonna be alot cheaper and easier to get than a 18".
As far as lowering, contact a place like Eaton Springs, they can custom make your stuff, just need to have the specs for your car, like, engine, a/c or not, etc.