Don’t ruin your whole car by going with manual brakes. Doing that is kinda like putting on a bulletproof vest and then shooting yourself in the head.
A lot of people don’t run Rucas at the track too. Just run it on stock first. You usually need some negative camber in the rear too. And if you don’t drop your car too much, you should be fine. I was running -2.0 camber in the rear the whole of last summer at the track. Car felt good.