J.
I have exactly the same rig - a '59 Apache with a 350 engine and Edelbrock Performer carb. Go ahead and take the top off the carb and have a look. These are great carbs and rarely need to be replaced. These are reworked AFB carbs without the sintered bronze fuel filters. They can get crap in the lines which can fall into the fuel bowl and can cause the needle-and-seat to stick. I suspect if you clean it up and inspect it closely, you won't have to buy a new one. If you don't want it, send it to me.