I'm hooking up hoses on my 120y with an A15 with a weber. It's been a while since I pulled it apart so wanted to double check which hoses go where. I've got as dizzy advance hose, vacuum hose for the brake booster (red circle), and I guess a heater hose (red square).

Doesn't seem to be an outlet that fits the brake booster hose on the manifold. The heater hose fits an outlet (green circle second photo), but looks like that's where the brake hose should go.

In the first photo I've circled and outlet that looks right for the dizzy advance. Is that right?

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Starting with the second photo, the hose with the red square is a fuel vapor vent hose and should go to the filtered side of the air cleaner.
The green circle is an engine vacuum port that could be used for your power assisted brakes if you can locate a fitting that the hose will fit onto and still screw into the manifold.
The red circle in the first photo is a vacuum fitting, what you need for vacuum advance is ported vacuum. To check for this run the engine at an idle and test for vacuum there should be none, but when engine speed is 1500 to 2000 rpm you have vacuum this is ported vacuum.
The reason why you want it this way is so that you don't have full vacuum advance at idle, and so that the advance starts to increase as engine speed increases.
Hope that this makes sense.

The green port is a little small for the power brakes. The factory used the large port on the top of runner #4, in the photo you have fitted a plug to that port.

1200 Brake Booster

Makes sense thanks. I think I even have a larger port for the manifold to suit the hose. I'll block off the fuel vapour vent hose as the air filter on the Weber doesn't support it .

Bad Idea.
Find a way to properly vent it so that it goes into the filtered side of the air filter so that the fuel tank will can vent. This is where the fuel tank gets an air supply so that it won't collapse as fuel is pulled out of it.
Just blocking it off could cause you to have fuel delivery issues.

Yes, whatever you, do not block the hose. Better to leave it unfiltered, just hanging there taped up on the firewall or something. There is only a small chance that the fumes will catch fire.