That's a '74-up Holley 1945 carb. It's going to have a lot of vacuum nipples not applicable to your '69 car. Carburetor operation and repair manuals and links to training movies and carb repair/modification threads are posted
here for free download; pull down the 1945 one so you can identify which port is what. Connect the "OSAC" or "Distributor" port to your distributor. Connect the "PCV" or "Crankcase" port to your PCV valve. Leave the bowl vent nipple (if this particular 1945 has one) open to the air. Blug all other vacuum ports on the carb. You'll need a different choke thermostat, which is just as well because yours has been brutalized and won't work properly even with a compatible carb, which this one isn't. The factory choke thermostat compatible with a 1945 isn't compatible with a pre-'72 exhaust manifold. To run a Holley 1945 you'd need a № 1234
electric choke kit, but to run a Holley 1920, Carter BBS, or Stromberg WA, you would need a № 1231.