Comparing Spring Relocate Kits

I just ordered new polyurethane bushings for the 6 cyl springs, u-bolts and spring perches.
I also have 3/8 X 2 HRS to make spring clamps.
Also just ordered grade 8 hardware for the clamps and the front spring eyes. My original spring eye bolts were 9/16, the new bushings have 5/8 holes. I'll just open up the mounting bracket holes.

Next, I have to cut off ladder bar and coil over shock brackets from the 9". What's a good way of going about this?

I have spring perches and U bolts on the way. I'll set the pinion angle and tack the perches. Then slide the rear out to fully weld. From what I've read, I have to keep from twisting the axle tubes. I'm guessing wet rags and run short beads, to keep it from over heating?