Drilled rotors are more for style rather than performance. The holes collect brake pad material and under heavy usage(a.k.a. track day bro) cracks can form from the holes.
Which is why race cars of today never use drilled rotors, they typically use plain face, slotted or the 'J' hook rotors.
Toyota said in previous interviews that the new Supra will offer great performance without the crazy price tag of a Porsche.
Maybe you have read this before. https://www.forbes.com/sites/peterlyon/2018/03/20/new-toyota-supra-targets-porsche-with-help-from-bmw/#527b27c9499c
I doubt the iron block would add crazy amounts of weight, unless it's built like a truck engine capable of cranking out 1000 hp while towing a yacht :confused::D
The JZA80 SZ-R is an NA Supra with RZ performance upgrades.
Hopefully this new A90 Supra SZ-R has at least a 380 hp turbocharged inline 6 and weighs 3070lbs.
Any more weight and any less power than that, I'm out of here.