Edit, I can't read.
What's the car used for? I see multiple issues.
I wouldn't run that arm even if it wasn't cracked. That stuff being welded is asking for issues like this. I get it, race car parts, but still. Ok, rant against welded steering components over.
First, is that monster spacer from the tie rod. When you input steering, it's trying to twist that arm along it's axis, back to the ball joint, as well as bending. Picture attaching the tie rod at the tip of that arm, then it's only bending, plus it gets that bolt far away from that tire.
Second, that arm needs triangulation, to prevent deflection and movement from the bending action we just talked about. This is likely what lead to the crack. That arm should have a flat horizonal plate much wider than the arm is, preferably going back and encircling that lower ball joint.
Third, what's that bolt at the upper ball joint? That upper control arm is sketchy as hell, but I'll give it the ' race use only' exemption, but I see a weld around that socket for the upper ball joint? If so, then is that whole tab for mounting the upper ball joint bolted to the control arm? Scary, so I'll assume I'm misunderstanding the picture.
Fourth, that lower ball joint is severely over angled. Is it at it's limit of motion? If so, the entire weight of the front end of that car is trying to lever that ball joint out of its socket, or just break it clean off. I'd investigate that.
Edit to add, is that an upper ball joint in the lower spot? I'm no ball joint engineer but I HIGHLY doubt that's kosher. I could be wrong (that's my datum, actually) but I don't think the upper ball joint has a rigid enough housing for lbj duty. Chrysler used that monster dammit FORGING (NOT a casting) for a reason.
I'm not sure I even want to see how that lower ball joint is mounted to the spindle. Frankly, the engineering shortfalls I see from my armchair are enough to make me wonder why the hell anybody would strap themselves into a car relying on these parts, let alone after broken welds start manifesting. I'm assuming this was all done to get rack and pinion steering.
Toss that ****. There's got to be a better way.
Just because they make it for your car does not mean you need to pay for it and then bolt it onto your car.
