Front end rebuild

I am just about ready to do a disc brake swap on my 70 dart and while I am at it I am going to rebuild the front end. I have the spindles, calipers, dust shields, rotors, upper and low control arms from a donor 1973 duster. My questions are:
Can I use the lower control arms that are on the car?
Do I buy inner and outer tie rod ends for a 70 dart or 73 duster?
Do I buy lower ball joints for a 70 dart or 73 duster?
Are there any places that sell a complete kit with Moog parts or should I go with poly bushings?
What idler arm do I buy?