Do I need to add the LCA braces?

buck351 said
Yes that's it. Everyone suggested the 1" bars for my 67 GTS, probably because of the 383. Thanks.

If you car is an original 67 383 GTS I would definitely not weld those plates on your lower control arms.

Very small gain for a lower handling performance use. And I would try to keep the non original stuff on a car like that all bolt on and removeable.