what is a "dizzy"? distributor? you probably can, since i have heard of people using carbs on UZs, and it would be pointless to change the ignition system.
try a search on carb swaps, you might come up with something.
Just bring two 4 cylinder distributor for old Toyota or Nissan (to utilize the switch) . and find some way to connect them (try to connect it to the cam shaft) .