For track competition, I can understand wanting to go with a coilover suspension. FWIW, my '70 Mustang has:
- Arning drop
- Scott Drake street performance coil springs
- Roller Spring perches
- Bilstein shocks
- 1-1/8" front anti-sway bar
- Factory rear anti-sway bar
- Export brace.
- (I have a Monte Carlo bar, but it won't fit with the factory shaker.)
I've had the car up to 100 MPH and it tracks straight as the string. The front end does not float or drift. Bumps in the road get soaked up nicely. (My car is a Mach 1 and it has a factory style front spoiler. Not sure if that actually does anything.)
Just today I went on a cruise with my Mustang club. I was following a brand new 2019 Bullitt edition Mustang with "magna-ride" suspension. We were moving pretty good on a windy, mountain road. When we stopped, the Bullitt owner expressed how surprised he was that my "old Mustang" was able to keep up with his new Mustang so well. He was quite impressed.
Of course, on a track, I'm sure that Bullitt Mustang would be able to do things my car can't do. That's OK. I didn't really build my car for track competition. I have done autocross one and I plan to do it more. It's just for fun. I'm not intending to win any championships.
But currently, my Mustang is much more capable than I am as a driver.