Can/should lower control arms be modified to accept sway bar?

I'll chime in on the braces also. I recently rebuilt my front end and haven't got it back on the road yet. I plan on running the Hotchkis bar on the front and didn't want to take any chances with my 43 year old lower control arms. They were like $20 from Mancini and my buddy welded them for free. Figured it was just good insurance. My buddy who welded said they used to dirt track an old Dart and "they never needed any bracing" but I thought what the hell could it hurt?

I'm sure someone will chime in with some real world experience with them, not just my jack stand racing thoughts!!