On Holleys, there is a plug on each of the bowls that will unscrew if you use a large flat blade screw driver. The float level is set with another large screw on top of the bowl. Loosen the lock nut and turn the screw to raise or lower the float level.
I must agree with the post on the heat getting to the starter. Same thing happened to me. If you have a speed shop in your area, they will most likely sell a "blanket" that will fit over the starter. It is aluminum on one side. Your starter may be getting very tired, it may be worth taking it in to have it tested while you have it apart for the blanket. One last thought on the starter, where the post comes out of the starter for the cable to attach to, there are two nuts. One nut secures the post to the starter itself. The second nut secures the cable to the starter post. It is very easy for the nut holding the post to come loose. Make sure the post is in secure to the starter or it will give you headaches.