you can do it.
Years ago there used to be kits you could buy to add a couple more carbs to your stock 2 barrel manifold by using a hole saw and welding them on, In the mid 50's I split my 6 cyl exhaust manifold, make new steel pieces, cut the stock manifold, then heated up the manifold in the wood burning stove with a hot fire when the folks were gone, I had the Arc welder cord thru their bedroom window, pluged into the elect. stove outlet in the kitchen, welded it all together with E 60 11 rod then ran it back inside the house and put it back into the firebox and let the fire slowly die down and slooow cool the manifold. Ufab intakes sells kits for V8's and some inliners but I haven't seen any for your engine, but you might be able to buy some pieces. My brother built a 6 carb manifold for his hemi in his dry lakes 36 ford. I have been looking at a 6 carb kit for My buick nailhead.