Broken upper control arm mount

Hey everyone, I am new to the board and mustangs. Decided to get into the fox body mustangs and got myself a 91 Gt with a blown transmission. I figured the thing was so cheap and parts are so plentiful both in the aftermarket and junkyard that I couldn't go wrong. Replaced the tranny, got some BBk Headers, and Ford Racing clutch. When installing the driveshaft prior to taking it on its first drive, I noticed the upper control arm mount to the body on the passenger side is destroyed, Somehow, it broke in several places and the previous owner attempted to patch it together with some crappy welding. (maybe due to the accident that happened to the fontend) So as I took my first drive, the rear end was all over the place, and to make matters worse, the used transmission I got grinds when I put it in second gear. I just can not win. Anyway, my question to you all: is there an aftermarket mounting bracket or does anyone have an idea of how to fix this. And with the tranny, does anyone think there is a simple fix, adjustment that can be made or did I buy a piece of crap tranny to go with my piece of crap car. Any help would be awesome, I may have to just screw it and buy a four cylinder and do a swap, unfortunately it sounds like the only good part of my car is the engine. Thanks for your help.