Historical plates any cop problems ?

Ive been using antique plates for many years in Pa. You can drive at night,go to as many car shows as you want and drive it once a week any where you want. I've had the plates on 8 cars over 20'years and never been stopped. As I understand I could drive the car to California to a car show if I wanted. Same with any legal year of car plate registered as antique/historical plate.