What model or list number? Typical PCM 351w engines used 4160 600 CFM carbs. To disassemble you have 6 screws from below holding base plate to main body and 4 long bolts on each end to remove the float bowl and metering block. Secondary side will have a metering plate held on by a few screws. At that point it's just remove the needle and seats and accelerator pump, clean everything real well and reassemble. A 4150 will be the same but with a metering block on the secondary side and a second accelerator pump if mechanical secondary. That's the quick and dirty, just disassemble everything, clean well, and reassemble.
Good rule of thumb for float height if you don't have a spec for that application is set the float to be level or a hair below as a good starting point. With internal adjustment floats it sucks to get it dialed in on a marine application with the carb sitting at an angle. Set the primary side a little low and secondary a bit high if it sits at much of an angle, or add a wedge spacer to get it more level.
Sounds like you may have one of those newer Holleys made similarly to an Autolite 4100. They didn't make a lot of them and I believe Summit or someone else bought the design and now they are sold as Summit brand. Not sure these were ever "marine" carbs but the bowls are one piece with the main body so not many places to leak. That's my best guess frmo your description, assuming it is actually a Holley and not an Edelbrock or other AFB style carb or a Quadrajet.
If it's a HOlley let us know the list number, should be on the choke horn. Posting a picture would help too, because from your description it's not a standard 4160/4150 style Holley.
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