You would need to extend the frame to the left to center the tabs over the aluminum engine mount. The way you have it in the picture, the left tabs are putting that rod or bolt or whatever in single shear and bending instead of double shear. Also, the right side mount is directly in the middle of a tube, which puts the tube in bending. This could both buckle the tube, and bind the engine mount because the tab will twist.

So no, don't weld it. Fix it so the load paths are better.