They are down draft on the Magna, or two are down draft and two are side drafts. The only difference in the 85 model, which I am using are spring lengths, and jets. I need to get the same springs for the front two cylinders of the Magna, 2-4, and the same jets, and put them in the 1-3 carbs. It is early in this dream, but it looks like it could work. Will it be better??? I don't know. I'm thinking the 1200 chamber vs the 1000 will need more fuel because of the additional lift of the 1000 cams, but maybe it'll be worse. I may need to jet down some. The first year of the v65, 1983, Honda used 140 mains in all four cylinders and it was almost a full second faster than subsequent years. In mine they dropped it to 120 mains. The front slide used a longer spring since it moved sideways in the bore. Please understand that I am just a surfer and use the internet for my info which is often unreliable, but luckily for you all, I don't know what I'm doing. I take any advice and weigh it. I've been wrong a few times. I'm just doing it as an experiment. It's not my day job. If it doesn't work, I have 77 carbs and 85 gl1200 carbs I can use. You guys and the guys at NGW are my main resources.
The other reason I'm trying this is to drop the whole top of the frames an inch or so. Lower riding with full clearance of the stock bottom.