Back in 68-70 my 64 Plm had 2.76 and a 4 speed (a little hard on the clutch) oval sprint track tires on 15 inch mag wheels, kinda tall and had to massage the well a little. Even at 80 mph it was still under 2000 rpm. Back in those days I knew where the radar traps sat so we went whatever mph we wanted. The 70 Z would run 3000 at 60 but I have no idea what gear it had, buzzed around the 95 interstate 3500-4000 or more all the time. To get a ticket one had to be real stupid, not like today.