Pros an Cons: SBP v LBP

I would guess (yeah, I'm guessing) the cheapest route to front disk would be to find an F, J, or M donor car and get the spindles and caliper anchors. You'll need to step up to the large ball joint at the point. Get the calipers and master while you're there and use the old ones as cores for new ones. Rotors, pads, calipers, and master can be had new/reman for this swap from any of the parts houses.

Going by current pricing with list on most of these parts, including what a junkyard will sell you the parts for possibly $300 invested in the fronts, give or take. If you want to jump up to drilled and slotted (yes, there are out there) and ceramics then you're talking substantially more.