My experience with 1934 and 1935 cars is that the 1934 had an all-chrome radiator shell, the 1935 had a painted shell with just chrome around the front as mentioned. Shutter plating or painting was an option, also as mentioned.
I think the black painted louvers look good, and are distinctive. Body color is fine too, that’s what I did with my ’31 phaeton.
While chrome looks great on the louvers, it can also overwhelm the front of the car.
I remember spending hours on the shutter assembly after having louvers chromed, making the pins fit in the top and bottom retainers. What fun.