welome to the site king jess

well if the mount isnt too tough to remove i would maybe push it into place where it sits and tack it, brace up the motor good and then take the mount off and weld it up good .
id fab a piece of steelplate that would fit crossways inside the mount nice and tight and put it right in the middle and weld it on both sides , basicly box only one side but put it in the middle of the mount
that should give more than enough strength