3 3/4" is a LOT. That thing has to have a wrinkle in the metal. Is this after you reinforced it? Or just stock?
If you reinforced it and it is that far off, you will have to start over, or start cutting out metal. If stock still, you can bend it back if you have the equipment. Then hold it in place with your reinforcment.
It need to be farily square so you don't have handling problmes, belt problmes, chain problmes............................I think you get it!
Paul