OP - Be aware that almost all axle u-bolts are torque to yield, and should not be re-used. Although probably millions have been reused without issue, personally I'd get new ones and torque them according to the fabricator.

Some useful info attached.
Attachments
U-Bolt Torque.pdf (2.82 MB, 14 downloads)

Geoff

1955 2nd Series 3600 235 cid, 4 sp. - Current
1979 Chevy K10 350 cid 4 sp -Sold
1955 2nd Series Wide Window 283 cid 3 sp - Totaled