So, you have a HIF type SU carburetor. They come in an assortment of sizes and types, though generally they are 1.5" (38mm) or 1.75"(44mm). It is not original to your car, nor is the intake manifold. It may ahve received a "Stage 1" upgrade - mainly a new carb and manifolds with an improved exhaust system. A wider photo of the top and front of the engine would indicate whether the engine is original to the car - the engine serial number would be more definitive, though that doesn't matter for this thread. You just want it running.
The HIF fuel bowl is at the bottom of the carb. To get at it, you need to remove the carb entirely. You will need a rebuild kit which should include all the appropriate seals and an fuel inlet jet and needle, and maybe a float.
To just clean the bowl and inlet jet:
To get to the jets and float, you invert the carb, remove the 4 bottom screws and remove the bottom cover. Inside you will see the float, (the orange thing in my photo). Its pivot shaft is a long screw removed from the outside of the carb. Once the float is out, you will see the back end of the inlet needle sitting in the brass 'jet' which looks like a hex nut with a smooth hole in it (not visible in my pic but just to the left of white 'snorkel'.
To get s wrench socket on the brass jet, you will have to remove more guts: the white snorkel is the bottom of then main metering jet. To get it out, you remove the fuel mixture lever (referred to as a 'bi-metal strip') by removing the screw with spring seen in my pic at 11:00 o'clock.
Now you can put a socket on the brass jet and remove it. It will most likely be stuck in with varnish, but once you get it loose, you should find on its other end a tiny fuel screen, which also needs cleaning, or replacement if you bought a new jet.
A tip: on some of the replacement inlet jets and needles, the tolerance between them was too close. When the carb warmed up, expansion of the jet and needle would cause the needle to stick, resulting in the flooding issue such as I struggled with. I even had this problem with a factory-new HIF-44. The solution was to gently file down the edges of the four fins (8 edges in all) on the needle, just 2 or 3 thousands of an inch before reassembly.
Another tip: if you don't touch the mixture adjustment screw, the main jet will be closer to the right position when you eventually try to start it again. When you do look inside, you will see that screwing in that screw (clockwise), pushes on the 'lever' which pulls the main jet down, richening the mixture.
If you do do a full strip-down, take lots of pics as you go of where and how springs, cams, nuts and other bits and bobs go... it can be a real puzzle getting it right. Lay things out on a tray in sequence helps too.
"Hang on a minute lads....I've got a great idea."