Help an idiot fix his carb

Hang on pal, that 9077 likely was used in conjunction with the Electronic lean burn computer. It would have had a throttle closed switch on the passenger side and a lever bolted to the primary throttle shaft on the passenger side, and THAT is where the idle speed was set. Without the ELB computer in good working order and all related components including the throttle closed switch known to be fully functional. You’ll need to drill and tap at the spot you originally started. If you try to set the curb idle using the fast idle weighted screw, the fast idle will be too high. Also you most likely will not have a vacuum advance port. You will have to drill (straighter) that also.