rack - side motor mount clearance

[PurdueSD]

Looking for some advice on motor mount/ rack clearance. As you can see in the pics, I have no space for my driver side motor mount. I was thinking about moving the frame bracket forward about 4" and figuring out a way to adapt back over. If i weld the frame bracket on 3/8ths lower and cut out a piece of 3/8ths plate to offset over will that be enough or do i need to totally redesign the part of the mount that bolts to the block?

Ive got a nice 220 mig and can fab up whatever i need, just looking for some input. Thanks guys!