Even though you bolt the rails to the oil pan the heat of the weld will cause the metal to warp and once you remove the bolts the rails will pull together on the side away from the brace you welded in.
You can use something like a small jack between the rails on the rear and spread them to the right dimensions. It doesn't take much so don't over expand them.
Spread them a little bit and check, and if they need more do it again untill all 4 bolt holes line up.
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