more than likely that 4 flu radiator is not letting enough air pass thru at idol and low speeds . more rows need more air ... air passing over the first row is heated , then the second heats it more then the 3rd row and it is easy to get very little cooling from the last rows . 2 rows with wider tubes would prob. be better . you say its running warmer , which makes me think it is not really overheating but rather , its not very effective at a low speed due to low air flow or water flow or both. thus the temp creeps up some.... the raw fuel smell is usually poor carb set up or base timing to low. 18 degrees initial timing is close . the 6 pack set up thread is a very good bench mark to use.