Look down low on the front of the carb. The spark port is left of the PCV pipe and the manifold vacuum port is on the right. You probably have some trash in the inlet seat causing the flooding, Try tapping that area with a screw driver handle. Call Edlebrock and ask them to send you an owner's manual, They sent me one for free.
The spark is the one for the vacuum advance tube to the distributor. The Inlet is the place where the gasoline goes in, top side left. It has two inlet needles and seats. they are under the air horn (top of the carb) on each side in line with the fuel inlet. You really need the owners manual. It is very thorough and tells you everything you need to know about the carb. There should be a threaded hole down low in the middle back of the carb. you can put a fitting in there for the power brakes if there isn't one on your manifold. You should use an adapter plate if you're mounting the carb on a spread bore manifold. You can buy one at the parts house. Just ask for a square bore carb to spread bore manifold adapter plate.