1. Get rid of the "driveshaft in a tube" called a torque tube. Go with 54 and later open driveshaft. You are adding a 350 and tranny so you are already
heading for open driveshaft.
2. The kit may work for you but expensive when most of the stuff can be taken off a donor truck. 10Bolt or 12Bolt truck if you want to maintain 6 lug.
3. What fits? Age old question. Have to measure widths and get as close as you can. Wheel offset will help.
4. The rear end is the same for a 2WD or a 4WD so don't understand you comment?
5. If you are going IFS 5 lug then you can look at car rear ends like Camaro, etc.
6. Use the search on here and the interweb to find what works.
7. Rear end widths are measure WMS to WMS. Wheel Mounting Surface across. Take off wheel, that's your surface.
8. Don't worry about anything but getting a good donor with the right width and the right ratio. The rest is cake. Welding and slight fab. Shock length and angle does not have to match your exact truck's shocks. There is no magic there. You are in restomod mode now.
9. Craigslist is the new Junk Yard. Cheaper, more honest, no entry fee, no tool fee and no hard hat required. Except for the good old rural guys, the rest turned into A'holes. OSHA and EPA made them do it.
10. Tim, Tommy, Ed and Joe have given the best responses already.
11. I suggest mocking it all up. Install motor and trans, find a rear end and install to same WB with proper pinion angle and weld perches per those parameters. Then shock design, we can help there depending on what parts you are able to save and scrounge. When all done, use a donor driveshaft with proper ends/yokes and have it lengthened or shortened by a driveshaft shop.
Like I said, I'm not getting this "I have a 10 bolt rear out of an 84 c10 but it's two wheel drive and I'm getting feedback that it won't work."
Maybe not correct width but what does 2WD have to do with it? 5 lug? there are plenty of 6 lug truck differentials. Billions. But your IFS will be 5 lug. Can't carry two spares, aye?
