Given the way most of us will be using these cars, i.e. street , occasional use and not track time I can't see how potential warpage and swept area concerns would be a factor if one were to opt for drilled and/or slotted rotors.
Personally I have 13" Cobra fronts on my 70 with five spoke 17" wheels. I am running solid rotors and will change to slotted if I ever need rotors or get bored just for the visual improvement. Sometimes the bling factor wins the day.