Welcome to the forum. Miami is where I was born and raised. Haven't been down for several years. Good old town and good memories. If, we're talking about Miami Florida. There are 13 Miamis in the US
Throw the instructions in the trash. 16:1 is too much oil. Reduce your oil ratio to no more than 24:1. After two or three gallons burned you can reduce it down to 32:1 and enjoy the bike.
Yes, you have the NT carburetor. Make sure it is sealed well to the intake manifold and the manifold is sealed to the cylinder with a good gasket. By sealing I don't mean relying on the metal to metal attachment of the carburetor to the intake. You need to use a good gasoline resistant sealer and/or an 'O' ring in the carburetor throat. Personally I don't use or trust the 'O' rings alone. They rely too much on a tight fit to seal.
The idle speed screw is only a mechanical stop that controls the heigth of the throttle slide. When screwed in it increases the idle speed. The carburetor throttle slide, or barrel, will only go in properly one way. The short slot goes to the left, looking down at the carb, and aligns the idle speed screw. The long slot goes to the right and is a guide that aligns with a pin in the carb body.