Fit CH on the Countach, Miura and Dino, that's the proper tire for the car if wanted more realistic performance of the cars ( acceleration, lateral grip, lap times )
, and with modern sticky rubber these vintage cars will driver much quicker with proper setup to suit ( similar to IRL ) and never use PP as a point of measurement, it's not accurate and there are many factors that do not taken into account in PP calculation like tire size ( width ) which increase grip the wider they are, stock gear ratio, chassis ( varies car to car ), aero ( with broken aero grad, makes things worse ), and suspension/LSD setup ( a messy one will make the PP useless )
I'm not going into the custom gearbox on the vintage cars, the flip will make these car faster and then there's glitch tuning
, low LSD ( close to open diff ), camber, ride height exploits, messing the weight distribution ( closer to 50/50 ion MR cars
) it all depends on how desperate a player to get a car as quick as possible.