Thanks trailbeast. I figured the hole wasn't original. It's weird that someone drilled it there when the carb is on a totally stock slant 6. I'll look for a replacement throttle plate as I really don't want anything falling into the motor.
Holley actually makes throttle plates with the hole in it. Not sure if yours is original, or someone else drilled it. If your car is running/idling good, I would drive it for now. Installing a screw ect will work, but that would suck, litterally, if it was to come out.
If it is bothering you to no end, then start looking for a replacement throttle plate.
Whether its from a vendor, or someone on the site. Google is always good ! :)
