As Tony said, virtually all "upgraded" upper control arms are drag race oriented. As such, they tend to increase suspension bind as the car's body rolls during turning due to the differing angles of the upper and lower arms. Not a good thing. Leave them stock.
Best plan is to go torque arm/3-link/5-link or even irs for corner-carving. The difference is amazing.
Just a thought, leave those back roads for the ricers and come out to an auto-cross or HPDE.
Mustang - The Great American Kit Car
#50 ESP/SM2 (backup) - Cal Club
Porsche - The Great German Kit Car - #50 SM2 Cal Club - #84 JP PCA