Honda-SOHC

Hi all I'm John, live in Cardiff and have been riding for 37 years. I'm currently riding a 1982 Kawasaki GPZ750 with a ZX9 engine in it. I recently bought a Honda CB400/4 F2, picture below I hope. It came  with some new parts, and some old, but was missing quite a bit. I've since bought clocks, idiot lights and a tank. Having difficulty finding carbs, can you fit other carbs  e.g. 500/4 or 550/4. Haven't decided what style to go with yet cafe, rat, original etc. need carbs first to see if it will even run.
I had one of these back in the 80's and loved it until it was stolen and torched.