You are in danger of having the spring pad separate from the housing and then the rear will drop to the pavement.
It happened to me in 1970.
I put traction bars on, with no U bolts or reinforcement.
Funny how the same mistakes get repeated after all these years!
You need four U bolts.
Check the housing for warping after welding.
They might have to heat a spot on top and quench it to pull the tubes back to straight.
I've done this to gain negative camber before.
You can have 1 degree neg camber (top of tire in) max. Welding on the bottom will move it to positive camber if not corrected.
You can certainly fix this one, but now would be the time to upgrade to a 12 bolt if you think you need the extra strength. That way if you spend money changing bearings or buying stronger axles etc, you will be spending it on a better base unit and have a stronger more valuable rear.
Once you open up that 10 bolt you will be faced with probably replacing some bearings and seals, maybe the axles if pitted.
Check my web page for First Gen Camaro suspension info:
David's Motorsports page
First Gen Suspension Page
67 RS 327
69 Camaro Vintage Racer
65 Lola T-70 Can Am Vintage Racer
[This message has been edited by davidpozzi (edited 02-11-2001).]