The positive (+) spade on the choke cap needs a wire from a 12v that is hot anytime the key is on (from fuse box to anything that is only hot with the key) The neg. (-) spade on the choke cap will go back to the carb for a ground. You can get additional information from watching the video.
To adjust the fast idle you will need to hold the throttle wide open (without the engine running). This will drop a lever under the choke housing with a 1/4" screw in it to slow it down. Turn it clockwise to speed it up turn it counter clockwise to slow it down. There's a video demonstration of this.
To adjust the fuel level you will need to take out the sight plug on the side of the fuel bowl. With the vehicle running loosen the lock screw on top of the fuel bowl and turn the nut clockwise to lower the level or counter clockwise to bring up the level. You want it to be at the bottom of the sight hole. If you turned it too far down it might bend the tang on the float. If you bent the tang on the float, you'll need to get back to a good starting point. You will need to take out the lock screw and turn the nut so the needle & seat is 1/2 way through the thickness of the nut then put the screw back in. Take the fuel bowl off and hold it upside down & level, then bend the tang on the float so the float is level in the center of the fuel bowl. This will get you back to a starting place. There's a video demonstrating this.
With the vehicle shut off, look down in the carb and move the throttle and see if the two sprays of fuel shoot as soon as the throttle moves. If it is not instant back off the nut on the pump arm 1 full turn counter clockwise then check it again. Do this until it is instant. There's a video demonstrating how to adjust the accelerator pump arm.
For street cars, the vacuum secondary carburetor works best on mid-weight or heavyweight cars with an automatic transmission. They are more forgiving than a double pumper is because they work by sensing engine load. The mechanical secondary carburetor is best on a lighter car with radical camshaft and a lower gear and manual transmission or on a car that is going to be used for racing purposes.