Craigslist find 12 bolt/ rear end swap Q's

[INSIDIOUS '86]

Found this http://seattle.craigslist.org/oly/pts/2138742062.html it's a 12 bolt rear from a 71 c10 and I was wondering with a 56'1/2 spacing between backing plates if it would fit in my 86 c10? I'm looking at changing gearing and or rear ends to get rid of my pos 2.73 10 bolt open end diff, I'm not sure if the truck 12 bolts were any good for drag or if it's hard to switch the 12 to a 5/5 lug axle if you have any suggestions on what I should do for the rear drivtrain? Any input would be much appreciated. And no ford 9 will not be ever come close to my truck lol
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