You need to either find a prop driver/thrust washer and collet to fit the crankshaft, or make one up on a lathe.
Then you may need to make a special prop nut and washer to fit the threaded part on the crankshaft. it depends on how thick the propeller is. Usually you make a spinner nut with a long shank on it to fit the threads and then you ream out the prop to fit the shank on the spinner nut.
The prop driver washer may allow enough clearance to work with the car carb, but you may have to flip the carb around and angle it. Otherwise you have to use a different carb.

You can see how it was done on this Toki or Fuji .05 engine. They made a more thick thrust washer to clear the carb and then the spinner nut was made longer with a threaded shank on it to extend the prop out farther. You need to ream out the prop more for this method.