Be careful of your location of the fittings inside the fender on the firewall. Check to see if the front tire will clear them when turned and at full up suspension travel. On my car i could not put the bulkhead where you have it.
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Instead of NOS, the car goes Ape ****! Lol!
I didn't see a reply to this by the OP, but this is CRITICAL!You should have set the rear end at 0* using jack stands, then welded the tabs on the rear housing all while being at near ride height. Also the lower arms should have been parallel. You might want to double check that.