Brakes/Coilover advice please

Debating on what to do on the front end of my 68 Valiant. I have 9" drums now but the front suspension needs a rebuild so I want to swap to discs at the same time. I do have the front disc brake setup for a 77 Aspen(spindles/rotors/calipers/hoses) but I dont want to put on used junk so that means by the time i use those parts as cores, i have $300 into the rotors/calipers/hoses/pads plus I still need a proportioning valve, bearings, seals, master cylinder and anything else I forgot.
The kits you buy (Wilwood, PST) seem expensive at the time but I think that may be the way to go.
Or have seen the Wilwood caliper mounts to bolt on the stock spindle. I heard these calipers dont have dust seals, will that be a big problem for the street?
Also, have been debating on a "cheap" coilover setup, stock k-member deal. Can I use coilovers on my stock LCA's?
thanks guys