Drum to disk brake swap followup questions help

Hi, this is my first drum to brake swap. working on a 65 barracuda. all parts are new and using a 73 dart as my new parts reference. i have read the other posts on this swap and the kelsey disk brake swap. still have a couple of questions that i am not sure of:
1. the bolts that are used to mount the lower ball joint to the spindle. i don't have them, i realize the existing ones are smaller from the drum setup. is this something that can be purchased at an auto parts store or home improvement store or this is a j-yard only thing?
2. caliper placement. using single piston caliper (new). no sway bar. does the caliper mount towards front or rear.. i have read both ways but don't know what is better or preferred.
3. the car has brand new a-frame bushings, ball joints, etc. i hate to rip all that out since its all new. so i read that from dr. diff i can get the upper ball joint taper adapter to keep the original a-frames and ball joints. i'd image they just slide in to take the gap up. correct?
that's it for now.. thanks in advance for the help