Hot Rods Volts to distributor

I have a 1979 chevy motor Im puting in my 1946 plymouth. Converting car to 12 volts. The chevy didtributor has a built in coil with two connections. May I go directly to the didtributor with 12 volts or must I reduce the voltage and if so is the drop to 9 volts ?

 

Yep HEIs run on 12 volts.

 

The one marked bat. Gets switched (on and off ) 12 volts

 

12volts

 

OK thanks guys.. Other terminal is marked for tack...