Prestolite Distributor Springs?

The FSM says that this distributor has the following advance curve:
1' to 6.5' @ 550 RPM
9.5' to 11.5' @ 900 RPM
12' to 14' @ 1800 RPM
I'm assuming that the 12' to 14' @ 1800 RPM would be right near the end of the travel of the slot where the heave spring starts to stretch?
Also do you double these degree numbers to get the crank degree numbers?