Underneath your car if your right e-brake wheel cable comes over to the drivers side that's a 70 setup. If the right e-brake wheel cable is short and only mounts to the right side framerail thats a 71 and up setup. Hope that makes sense. The intermediate cable on a 70 goes to the left side back of the car while the 71 intermediate cable makes a u shaped loop connecting the right and left sides at the back.
I don't know if there is a # stamped on the pedal setup or not, I have a 71 pedal in my storage container, If I have time tomorrow I'll grab it a get a few pictures and see if there's a #.
Sheldon