413 golden lion

It's probably a 8 3/4, look for a tag on 1 of the center section nut's.  
age is no lock on brillance

If you have a 440 and trans that would be the way to go.jmo  
age is no lock on brillance

For street use it should be a dual plane intake. Mopar performance has one that I use on street motors #P5153525 aluminum . Edelbrock also has one #EDL 2191.
You can actually use your original carb, maybe a good idea to ck floats, needle and seats etc.
If you start to change things inside the motor at a later date then you can move up on carb size.
What rear is in the car? Is there a cover on the back or does it drop out from the front?
Either way,when it was built there was a tag on the back or front {depenging on which way it comes out} that would give you a 3 digit #. 3.23,3.91,3.54 etc.
If the tag is missing jack up the car so both rear wheels are off the ground. Rotate one of the rear tires so that the valve stem is at the bottom look at the position of you flange where the driveshaft connects to the rear. Make a full turn with the tire coming back to where you started from with the valve stem. As you make the full turn count the full turns of the rear end flange. If you come up with 3 1/4 turns it is a 3.23 gear and so on.