1. Not sure if there are any that are EXACT bolt-ins
2. Dana 60 front - $400-1000 for a junkyard rebuilder?
Dana44 front $100-$400 for a junkyard rebuilder
3. Yeah - make sure the gear ratios are the same (or plan on a swap), watch out for axles that are too wide, measure the perch widths to see what fits, look for flat-top knuckles to save yourself some time (you need them for crossover steering for the SOA), avoid closed knuckles, make sure the U-joint girdle pinion thingy (brain fart) matches your u-joints (or plan for modifications)
4. Don't know of any kits to swap your rear 20 or 44 to 8 lug...but there may be some
5. Uhh...the axle?
PS - do a search on SOA in this forum (the search function is at the top of this screen) and read up...SOA has been discussed many many times and there is good info here - but nobody want to explain it all again for the hundredth time. However, if you come up on any specific questions that you can't seem to find the answer to, feel free to ask.