$$ Cost on a disc brake change $$
Want lower $ set up
FMJ spindles
Get 73-76 uppers or mod your current ones with a larger ball joint sleeve.
Grab a disc prop valve or put an adjustable in the rear line.
Might spend $400
Here's my breakdown
FMJ spindles/calipers/rotors $65
Cut rotors $25
New Calipers/pads $60
New Hoses $20
Bearings/Seals $20
Uppers $55
UCA Bushing $24
Moog Ball Joints Upper/lower $115
Paint $12
Total $396
Modding the old upper arms would cost you about $12
The results...
Be patient and you can find stuff. E-bay sometimes has some great deals